Claimed Elements

Magnesium is the lightest metal anyone builds with, about two thirds the weight of aluminium for the same volume, which is why it ends up in camera bodies and laptop lids. Its quieter distinction is the one that matters here. Natural magnesium is a fixed mixture of three kinds of atom, which differ only in weight: 79 parts in a hundred are magnesium-24, 10 parts magnesium-25 and 11 parts magnesium-26. That mixture holds steady in seawater, in basalt, in bone and in factory ingot. A ruler is only useful if it does not stretch, and this one does not.

On 14 September 1957 Ibrahim Sued's column in O Globo in Rio de Janeiro printed a letter enclosing three small pieces of white metal, describing a disc that had burst over the beach at Ubatuba in São Paulo. Olavo Fontes arranged the first analysis that November at Brazil's government Mineral Production Laboratory: it detected no trace elements and the metal was written up as 100 per cent magnesium. Oak Ridge National Laboratory ran the fragment again in September 1958 and reported 99.8 per cent magnesium, with iron, silicon and aluminium in the parts-per-million range. That purity was the whole basis of the claim, because magnesium that pure was said to be unobtainable in 1957. Roy Craig, analysing for the 1969 Condon Report, found the reverse: the metal was less pure than the commercial magnesium Dow Chemical was making at Midland, Michigan at the time, and Dow supplied triply sublimed magnesium for the comparison. The composition settled near 99.9 per cent magnesium with strontium at 500 parts per million, zinc 500, barium 160, manganese 35, chromium 32 and copper 3. Craig noted that strontium was not then a known commercial addition to magnesium, and that thread is still loose. Garry Nolan has said in interviews that a sample he examined carried magnesium ratios roughly 30 per cent off normal; the written measurement is Robert Powell, Michael Swords, Mark Rodeghier and Phyllis Budinger in the Journal of Scientific Exploration in 2022, who ran the Ubatuba fragment on high-resolution mass spectrometry in 2017 and 2018 and reported the magnesium ratios inside terrestrial limits.

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Sublimation and distillation take commercial magnesium to 99.9 or 99.99 per cent as a matter of routine, and Dow was making triply sublimed magnesium in the 1950s. Those processes do shift the blend of atoms, by a few parts in a thousand, because the lighter ones boil off first. That is the size of the effect the bench actually sees.

What a laboratory would measure

The three kinds of magnesium atom against an international reference sample, plotted against each other. Boiling, distilling or subliming a metal shifts the mixture along one particular line of slope near 0.521; material that formed around a different star sits off that line. Split whatever is left of the fragment and run it blind at two facilities.

Every aluminium atom on Earth is the same weight. There is only aluminium-27, and roughly twenty of the 118 elements are like that. It has a consequence that runs right through the roll call: the standard test on a claimed exotic sample is to weigh its mixture of atom types against the terrestrial mixture, and on aluminium there is no mixture to weigh. Aluminium is also 8.2 per cent of the crust by mass, third behind oxygen and silicon, and it holds itself together with an oxide skin about four nanometres thick, roughly fourteen atoms, that reforms in milliseconds every time you scratch it.

Aluminium appears in nearly every element list read out on The Secret of Skinwalker Ranch since the series began on History in March 2020. Iron and aluminium in the metal flakes in season 7. Iron with silicon, aluminium, magnesium, calcium and manganese in the season 3 alloy, read on a SciAps X-550 hand-held analyser brought to the ranch by the company's own chief technology officer in 2022 and written up afterwards on the company blog. Carbon, oxygen, silicon, magnesium and aluminium at the ceramic surface in season 6. It is the element most often present and the element that tells you least.

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Accelerator mass spectrometry, which sorts atoms by weight after speeding them up, reads aluminium-26 against aluminium-27 down to about one part in a thousand million million: like picking one particular second out of thirty million years. Meteorites picked up soon after they land carry roughly 40 to 70 aluminium-26 decays a minute per kilogram, put there by cosmic rays while they were still in space.

What a laboratory would measure

The aluminium-26 and beryllium-10 pair. Anything that spent real time outside the atmosphere and the Earth's magnetic field carries a cosmic-ray record, and the ratio of the two even gives the depth it sat at and how long it was up there. Anything made in a factory carries essentially none. The technique is mature and widely available, and no result from it has been published for the Ubatuba fragment, for the Art's Parts specimen, or for any ranch material.

If unusual purity is the argument, silicon already holds the record and it was set by people. The International Avogadro Coordination grew single crystals enriched to 99.9995 per cent silicon-28 and ground them into spheres about 93.75 millimetres across, a little smaller than a softball, each weighing exactly a kilogram and round to within tens of nanometres. Those spheres pinned down the Avogadro constant and, in 2019, redefined the kilogram itself. Later batches reached roughly one wrong atom in every hundred million, which is one grain in sixty kilograms of sugar. Silicon is also 28.2 per cent of the crust by weight, more than a quarter of everything under your feet.

Silicon dominates the ceramic element lists on Skinwalker Ranch, at the surface and in the interior both, and it is a major component of the Council Bluffs, Iowa sample from 17 December 1977 that Garry Nolan, Jacques Vallée, Sizun Jiang and Larry Lemke analysed in Progress in Aerospace Sciences, published online on 9 December 2021. That paper's own isotope results, for titanium, iron, chromium, silicon, aluminium, magnesium, manganese and sodium, were reported as consistent with terrestrial values, with a slightly high iron-57 reading attributed to an iron-hydride interference in the instrument. A reviewer also noted that aluminium and silicon exceed iron in most of the subsamples, which sits awkwardly against the 1977 and 1978 descriptions of the same material as chiefly iron.

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The silicon-28 spheres held at NIST in the United States, PTB in Germany and NMIJ in Japan. Alongside them, ordinary semiconductor polysilicon at 99.9999999 per cent, made by the tonne for chip fabs.

What a laboratory would measure

Silicon-30 against the NBS-28 reference, and X-ray diffraction to say which mineral the silicon is sitting in. Silicon locked in quartz or feldspar means rock. Silicon as the free element, or as silicon carbide, means a furnace. That single distinction resolves most unusual-silicon claims in an afternoon.

Titanium carries some of the clearest fingerprints of where matter was made. The proportions of titanium-50 and titanium-46 differ between meteorite families in a way that splits the solar system in two, into material that formed inside Jupiter's orbit and material that formed outside it. Grains of silicon carbide recovered from meteorites, older than the Sun, carry titanium-49 excesses of hundreds of parts per thousand. And titanium-44, with a half-life of 59.1 years, glows as a live supernova tracer that has been mapped in the wreckage of Cassiopeia A. Meteoriticists reach for titanium first, precisely because it answers this question.

Titanium headed the atomic emission list read out for the Skinwalker ceramic material, titanium with calcium, iron, aluminium and vanadium, which Travis Taylor described on air as similar to the main ingredients of stealth materials. Titanium, aluminium and vanadium together are also the make-up of Ti-6Al-4V: about 90 per cent titanium, 6 per cent aluminium and 4 per cent vanadium, the most-used titanium alloy on the planet, holding roughly half the aerospace titanium market. The weight ratio separates the two readings, and an electron microprobe returns it.

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Ti-6Al-4V in jet engine compressor blades, in bicycle frames and in hip replacements. It sits at 4.51 grams per cubic centimetre, about 57 per cent the density of steel, at comparable strength.

What a laboratory would measure

Titanium-50 and titanium-46 against the OL-Ti reference on a multi-collector mass spectrometer. Terrestrial, lunar and Martian material all fall on one tight, well-mapped line; anything formed elsewhere sits measurably off it. Then run the weight ratio on an electron microprobe. If titanium, aluminium and vanadium land near 90 to 6 to 4, the answer is a commodity alloy and the question moves on.

Vanadium is happy in four different charge states in water, and each one is a different colour: lavender, green, blue and yellow. That is what makes the vanadium flow battery work, and it makes it the one common battery chemistry with the same element in both tanks, so the two liquids seeping into each other shift the state of charge rather than poisoning the cell, and a rebalance puts it back. Where the two sides hold different elements, that same leak carries the other element across, and a rebalance does not bring it back. Vanadium's rarer atom type, vanadium-50 at roughly one atom in 400, is not quite stable either: it decays with a half-life around 2.7 × 10¹⁷ years, about 20 million times as long as the universe has been running, which is the only reason any of it is left.

Vanadium closed the atomic emission list for the Skinwalker ceramic, presented on air as resembling stealth-material ingredients. Two ordinary sources sit directly underneath it. Ti-6Al-4V carries about 4 per cent vanadium, so titanium and vanadium arriving together is expected. And the ranch sits on the Green River Formation of the Uinta Basin, where United States Geological Survey work records local enrichment of vanadium, cobalt, nickel, copper and zinc above ordinary shale, and where gilsonite, the tar-like mineral mined in veins across Uintah County, carries vanadium, nickel, iron, magnesium and calcium locked into its organic matter. Vanadium in a Uinta Basin drill sample is close to the local default.

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Grid-scale vanadium flow batteries at the tens-of-megawatt-hour scale in China and in Australia, where the electrolyte is a liquid you can store in a tank and top up rather than a cell you replace. Also vanadium pentoxide catalyst beds, which have made most of the world's sulphuric acid for a century.

What a laboratory would measure

An electron microprobe for the vanadium to titanium to aluminium weight ratio. Near 4 to 90 to 6 means the aerospace alloy. If instead the vanadium sits in an oxide, or bound into oil-shale organic matter alongside nickel, it points straight at Green River kerogen or gilsonite residue, and a local gilsonite standard run in the same session settles which.

Zinc comes in five stable weights, and they separate measurably whenever zinc is boiled or smelted, because the lighter atoms leave first. That makes the zinc-66 reading a working tracer for industrial emissions: zinc in a soil sample can be told apart from ore zinc and followed back to the smelter it drifted from. Inside a layered piece of metal it answers a sharper question, which is whether that layer condensed out of a vapour or was poured.

Zinc is the alloying partner in the magnesium matrix of the Art's Parts specimen. In the 1990s an anonymous sender signing himself "A Friend" posted several fragments to Art Bell, host of Coast to Coast AM, saying they came from the 1947 Roswell event by way of a military grandfather. The best-known piece is about 44 by 32 by 6 millimetres, a large postage stamp with real thickness, micron-layered bismuth against a magnesium-zinc alloy. Oak Ridge National Laboratory, contracted by the All-domain Anomaly Resolution Office and finishing in April 2024, measured the zinc varying from 1 to 4 per cent by weight through the specimen.

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Magnesium-zinc alloys at 1 to 4 per cent zinc are a commodity family: ZK60 runs about 5.5 per cent zinc with a little zirconium, ZE41 about 4.2 per cent. Vapour-deposited magnesium-zinc coatings were an active research subject in the middle of last century, which is the window Oak Ridge's own assessment points at.

What a laboratory would measure

Zinc-66 against the standard reference zinc, layer by layer through a cross-section. That says whether this zinc passed through a vapour, and where in the stack it happened. Zinc-70 is also a candidate for a rare double decay nobody has yet caught, which is a separate and open bench question.

Tellurium-128 decays so slowly that it holds the record outright. Recent work from xenon trapped in ancient tellurium ores puts its half-life near 7.7 × 10²⁴ years, about 560 trillion times as long as the universe has been running; older determinations give about 2.2 × 10²⁴. Either way, put a kilogram of ordinary tellurium on a bench and roughly one of its tellurium-128 atoms breaks apart every eight years. This is the longest measured half-life of any kind, which is a different record from bismuth's and a much longer one. Tellurium is also one of the scarcest stable elements in the ground, about a gram in a thousand tonnes of rock, rarer than gold or platinum, while being far more common in the solar system at large. The usual explanation is that most of Earth's tellurium left as a gas while the planet was still assembling.

In "Rocket Men", season 7 episode 8 of The Secret of Skinwalker Ranch, aired 9 July 2026, Erik Bard used his portable X-ray fluorescence analyser, a hand-held reader that fires X-rays at a surface and names elements from the light that comes back, on a metal flake recovered during drilling. That flake read as iron and aluminium only. The reported contrast was that earlier flakes had carried iron, aluminium, europium and tellurium, described on air as elements found in the materials used to make spacecraft. Tellurium's industrial homes are thermoelectric modules, cadmium telluride solar panels, rewritable discs and free-machining steel. The nearest real link to spaceflight is that the nuclear batteries on Voyager and Perseverance do use telluride thermocouples. On a hand-held reader the tellurium lines also sit in a crowded part of the spectrum and are easy to confuse with lines from commoner elements in an iron-rich flake, so this is a reading to confirm, not an identification to build on.

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CUORE, under the mountain at Gran Sasso in Italy, runs 988 tellurium dioxide crystals totalling about 741 kilograms at about ten millikelvin, ten thousandths of a degree above absolute zero, watching for a decay of tellurium-130 nobody has seen yet. It is the largest object anyone has built out of tellurium for physics.

What a laboratory would measure

Confirm the identification first, on solution mass spectrometry or a wavelength-dispersive microprobe, either of which separates lines a hand-held reader cannot. Then check what the tellurium travels with. Tracking alongside bismuth points at a thermoelectric module; tracking alongside cadmium points at a solar panel.

Europium is the least dense of the fifteen lanthanides at 5.24 grams per cubic centimetre, lighter than vanadium and lighter than zinc, because its half-filled electron shell holds its atoms further apart than its neighbours manage. It is also the most reactive of them, tarnishing in open air the way a fresh-cut alkali metal does. And europium-151, which is about 48 per cent of natural europium, turns out not to be stable: a team working under the mountain at Gran Sasso caught it decaying for the first time in 2007, using a calcium fluoride crystal doped with europium as both the source and the detector, and put the half-life near 5 × 10¹⁸ years, some 360 million times the age of the universe.

Europium was reported alongside tellurium in the earlier Skinwalker Ranch metal flakes and described on air, with tellurium, as an element found in the materials used to make spacecraft. Europium's actual trade is colour. It is the red and the blue emitter in fluorescent lamps and older television screens, and it is in the security ink of euro banknotes, which is why they glow in patches under an ultraviolet lamp. It also swallows neutrons well enough for reactor control rods. Like tellurium, its lines are a plausible misassignment on a hand-held reader pointed at an iron-rich flake, so what exists here is a reading to check, not a finding. The team said they intended to send flakes to Utah Valley University; no report from that has been published.

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Europium-doped yttrium oxysulphide has been the standard red phosphor since the 1960s. If a television or a fluorescent tube in the last sixty years showed you a red, europium made it.

What a laboratory would measure

The same as tellurium: confirm or drop the assignment on an instrument that resolves the lines, then publish the raw spectrum with the fitted peaks marked, so anyone can check the identification themselves. That one file would settle the identification either way, in an afternoon.

Mercury melts at minus 38.83 degrees Celsius and boils at 356.73 degrees, so at 25 degrees and normal pressure it is the metal that is liquid. The qualifier is worth keeping: caesium melts at 28.5 degrees Celsius, gallium at 29.8 and rubidium at 39.3, so on a hot Australian afternoon mercury has company; at the standard reference temperature it stands alone. It is also heavier than people expect, at 13.53 grams per cubic centimetre, so a one-litre milk bottle of it weighs about 13.5 kilograms and a lump of iron floats on top. Its second oddity is in the atoms. Mercury is one of very few elements whose odd-weight types, mercury-199 and mercury-201, separate in a way that does not depend on weight at all, driven by the magnetism and the shape of their nuclei. That signature traces mercury pollution back to the stack it came out of, and it is a working forensic tool.

Red mercury surfaced in the collapsing Soviet arms market between about 1991 and 1995, described as a mercury and antimony compound with extraordinary properties and offered at up to about 300,000 United States dollars a kilogram, roughly A$418,000 at 71.7 US cents to the Australian dollar, 28 August 2026. Dozens of intermediaries petitioned Russian authorities for export licences. Every sample seized and analysed in the open literature turned out to be something cheap and well known: mercury(II) iodide, mercury stirred through red dye, or plain elemental mercury. The story has been recycled since, including as a claimed coronavirus cure and, in one variant, as something said to be extractable from old sewing machines. The full account, and the mercury-fuelled engines that really did fly, sit on the red mercury page.

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Mercury(II) iodide is genuinely, startlingly red, and costs a few dollars a gram. It comes with a memorable bench test: heat it past about 127 degrees Celsius and it turns yellow, then goes red again as it cools. Several samples sold as red mercury were exactly this.

What a laboratory would measure

X-ray diffraction plus mass spectrometry names the compound in under an hour, and a density reading alone would flag anything unusual, because density follows from how heavy the atoms are and how tightly they pack, so a compound of mercury and antimony lands in a narrow band and anything outside it shows up on the first weighing. So far every sample handed to a laboratory has come back as a compound already in the catalogue.

Three of lead's four stable atom types are the end of a decay chain: lead-206 comes from uranium-238, lead-207 from uranium-235, lead-208 from thorium-232. Only lead-204 was there from the start. So an ore body's lead mixture is set by its age and by how much uranium and thorium sat beside it while it aged, and different ore bodies carry signatures you can tell apart. That is how archaeologists trace a Roman water pipe back to its mine, and how safeguards laboratories trace seized ore concentrate. Lead that formed somewhere else would have no reason to land inside the terrestrial field, which is what makes the reading load-bearing.

Lead was not in the Art's Parts claim at all. It was found. Oak Ridge National Laboratory measured the top layer's composition and crystal structure for the All-domain Anomaly Resolution Office and found bismuth sitting with nearly equal parts lead, banded and repeating through the specimen, with columnar magnesium grains running across the banding. Oak Ridge reported the lead signature as fully consistent with common lead that occurs naturally on Earth, and the magnesium signature as fractionated but within normal terrestrial compositions. Its assessment, published on aaro.mil, is that the specimen is terrestrial, consistent with mid-twentieth-century magnesium alloy research and experimental manufacturing, later damaged by mechanical and heat stress.

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Betterton-Kroll debismuthising has been standard lead refining since the 1930s: molten magnesium floated on liquid lead pulls the bismuth out as a magnesium-bismuth dross, and what skims off is bismuth intergrown with lead and magnesium. Nicholas Reiter, commissioned by Linda Moulton Howe in 1996, proposed that origin for this specimen decades before anyone sectioned it.

What a laboratory would measure

The chemistry has been measured. What has not is where the object was before 1996: the 1947 attribution rests on an anonymous letter, and no document, receipt or photograph has been produced to attach it to a place or a date. That is a records question now rather than a bench question.

Bismuth is the most diamagnetic metal there is: it pushes back against a magnetic field about twenty times harder than water does, at a volume susceptibility near minus 1.66 × 10^-4. Lay a small strong magnet between a bismuth plate and a lifting magnet above, and the little one hangs in mid air with nothing touching it, no power and no cooling. Bismuth also expands about 3.3 per cent when it freezes, a habit it shares with water, gallium, silicon and germanium and very little else metallic, and it conducts heat at about 7.97 watts per metre per kelvin, down among the poorest conductors on the metal list with manganese at 7.81 and plutonium at 6.74.

And bismuth-209 sat on the list of stable isotopes for a hundred years, until Pierre de Marcillac and colleagues at Orsay in France caught it decaying with a scintillating bolometer and published the half-life in Nature in April 2003: 1.9 ± 0.2 × 10¹⁹ years. That is more than a billion times as long as the universe has been running, and it is the longest half-life ever measured for alpha decay, where a nucleus spits out a helium core. Longest for alpha decay, not longest of any kind: tellurium-128 holds that, by a very wide margin. For a mind's-eye version, hold a kilogram block of bismuth, about the volume of a quarter of a soft drink can, containing some 2.9 × 10²⁴ atoms. Roughly one of them decays every five minutes. That rate is why it took a hundred years and a detector cooled to a few thousandths of a degree above absolute zero to catch it.

The Art's Parts specimen is micron-layered bismuth against a magnesium-zinc alloy. The piece passed to To The Stars Academy, which sold it to the United States Army for 35,000 United States dollars, about A$49,000 at 71.7 US cents to the Australian dollar, 28 August 2026. The claim attached to it was that the layering could act as a terahertz waveguide, a channel that steers very short radio waves, and so allow inertial mass reduction. Oak Ridge, in the analysis it completed in April 2024, found the bismuth amorphous and nanocrystalline rather than the pure crystalline bismuth such a waveguide would need, and noted that the properties required to steer terahertz waves would in any case be disrupted by the bismuth being mixed through with lead. One thing the whole case turns on: every bismuth atom is bismuth-209, so there is no bismuth ratio to test, which is exactly why Oak Ridge went to the lead sitting alongside it.

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Bismuth telluride modules, the solid-state coolers inside a camping fridge or a wine cabinet, are layered bismuth doing a real job with no moving parts. Low-melting bismuth alloys such as Wood's metal go liquid in a cup of hot tea, which is how they hold fire sprinklers shut until a room gets hot.

What a laboratory would measure

Terahertz time-domain spectroscopy on the specimen itself, which measures whether it guides those waves rather than inferring it from a picture of the layers. Alongside it, a thin cross-section under a transmission electron microscope for the layer thicknesses and how sharp the interfaces are, and the lead ratios plotted against the standard growth curve for common lead.

Natural uranium is 99.2742 per cent uranium-238, 0.7204 per cent uranium-235 and 0.0054 per cent uranium-234, and it varies very little. Joe Hiess and colleagues measured 44 zircon crystals from around the world and published a uranium-238 to uranium-235 ratio of 137.818 plus or minus 0.045 in Science in 2012. A number that steady across a whole planet is what lets any departure from it mean something. There is one known natural exception, and it is a good one: at Oklo in Gabon, found in 1972 when French inspectors noticed ore assaying below the natural figure, seams of ore ran as natural nuclear reactors about 1.7 billion years ago, roughly a third of the way back to the Earth's formation, and burned their uranium-235 down to as low as 0.29 per cent in places. Uranium is also less exotic in the ground than its reputation: at 2.7 parts per million it is about thirty times commoner than mercury and hundreds of times commoner than gold.

Uranium sits behind the radiation claims rather than the sample claims. The Secret of Skinwalker Ranch has reported elevated ionising radiation across several seasons and, in season 6, short-lived isotopes said to decay too fast to exist unless nuclear reactions had happened recently. The Uinta Basin's Green River Formation carries natural uranium, thorium and potassium-40 through the section, plus radon in the air, so the local background is not a flat line and a reading has to be measured against the rock it came out of.

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Nuclear safeguards laboratories fingerprint seized material by its uranium ratios and its trace rare-earth pattern, and can often name the mine and the process it came through. The same method sorts reactor fuel from the leftover tails of enrichment, which run 0.2 to 0.3 per cent uranium-235.

What a laboratory would measure

Gamma spectrometry, which reads the radiation coming off a sample to name the isotopes in it, on paired samples taken on the ranch and off it at matched depth in the same rock, with the activity of each isotope given in becquerels per kilogram: one becquerel is one atom breaking down each second. A short-lived isotope is only unusual when its parent is missing from the sample. And for any uranium at all: uranium-236 against uranium-238. Uranium-236 sits near one part in a hundred million million in ore, which is one particular second picked out of about three million years, and is made by neutron capture, so a reading above roughly one part in ten thousand million, one second in about 320 years, is proof the material has seen neutrons.

Moscovium is real and it has been made, four atoms at a time. A team at the Joint Institute for Nuclear Research at Dubna under Yuri Oganessian, working with Lawrence Livermore under Ken Moody, fired calcium-48 at an americium-243 target in 2003 and got four atoms. IUPAC, the international union of chemists that settles element names, named it after Moscow Oblast in 2016. The known types run from moscovium-286 to moscovium-290, and the longest-lived is moscovium-290 at about 0.65 seconds, about the length of a slow blink, with the true value somewhere between 0.45 and 1.14 seconds. Roughly a hundred atoms have been made anywhere by anyone. What is genuinely unusual at this end of the table is not stability but speed: the inner electrons move fast enough for relativity to distort the chemistry, so moscovium is expected to behave less like bismuth than its position in the column suggests. Its bulk figures in the roll call are predictions, not readings, because there has never been enough of it to put on a scale.

In May 1989, in interviews with George Knapp on KLAS-TV in Las Vegas, Bob Lazar said he had worked at a site he called S-4 near Papoose Lake on craft fuelled by a stable element 115, and described a wedge of about 223 grams. In 1989 element 115 was an empty slot on the chart, predicted but unmade, which is a different thing from unknown. A 223 gram wedge of moscovium-290 would hold about 4.6 × 10²³ atoms, some sixty thousand times the commonly quoted estimate for every grain of sand on Earth, and at the measured half-life it would put out roughly 790 gigawatts in its first instant, about twenty-five times what Australia's power stations deliver on average, then fall away within seconds. The full arithmetic, the island of stability and the gravity question are on the element 115 page.

Nearest built thing

The closest thing to a weighable superheavy sample is the microgram-scale berkelium-249 and californium-249 targets that Oak Ridge's High Flux Isotope Reactor makes for these experiments. Those are among the most expensive materials on Earth by weight, and they are the input rather than the product.

What a laboratory would measure

Anyone holding a macroscopic sample could settle it in an afternoon. A high-purity germanium gamma detector and an alpha spectrometer would show either the decay chain of a superheavy nucleus or the absence of one. And a 223 gram wedge of any moscovium anyone has made would not be an inert wedge on a bench; it would be a self-heating decay source, and the heat would be the first thing you noticed.