Element 115, officially named moscovium (symbol Mc), is an extremely short-lived synthetic element that exists only in laboratories, decaying within fractions of a second into lighter elements through a rapid chain of alpha particle emissions. It has no practical applications, no stable form, and no role in energy production or propulsion, despite decades of internet speculation to the contrary. What it does do is give physicists a window into how atomic nuclei behave at the outermost frontier of the periodic table, where the rules governing matter start to bend in unusual ways.
How Moscovium Got Its Name and Place on the Table
Moscovium was first synthesized in 2003 at the Joint Institute for Nuclear Research (JINR) in Dubna, Russia, in collaboration with researchers at Oak Ridge National Laboratory and Lawrence Livermore National Laboratory in the United States. The team bombarded americium-243 targets with calcium-48 ions, producing a handful of atoms of element 115. After more than a decade of additional experiments to confirm the results, a joint IUPAC/IUPAP working party officially recognized the discovery, and in 2016 the element was given the name moscovium and the symbol Mc, after the Moscow Oblast where Dubna is located.1Pure and Applied Chemistry. Names and symbols of the elements with atomic numbers 113, 115, 117 and 118 (IUPAC Recommendations 2016) It sits in Group 15 of the periodic table, directly below bismuth.
How You Make Atoms of Moscovium
You cannot mine moscovium or find it anywhere in nature. Every atom has to be assembled one at a time inside a particle accelerator by smashing lighter nuclei together at enormous speeds and hoping they fuse rather than shatter. The most successful recipe remains the original one: firing a beam of calcium-48 ions at a target of americium-243. Theoretical modeling has also explored other possible routes, including reactions involving plutonium, neptunium, uranium, and curium targets paired with various projectile ions, though most of these remain on paper or yield even smaller predicted cross sections.2Physica Scripta. A study on the synthesis of superheavy element Mc (Z = 115) using lead, bismuth and actinide targets
The yields are vanishingly small. A recent experiment at the China Accelerator Facility for Superheavy Elements (CAFE2) ran the calcium-plus-americium reaction and detected a total of 21 decay chains: 20 attributed to the isotope moscovium-288 and just one to moscovium-287.3Chinese Physics Letters. Production of 287,288 Mc isotopes in the 48 Ca + 243 Am reaction at China Accelerator Facility for Superheavy Elements Twenty-one atoms, after weeks of continuous beam time. That gives you a sense of how rare and difficult these experiments are. Each atom that forms exists for only a tiny fraction of a second before it decays, so researchers never accumulate a visible sample. They identify moscovium entirely by the signature chain of radiation it leaves behind.
Improving those odds is a major engineering challenge. At Dubna, a next-generation gas-filled recoil separator called DGFRS-2 was built specifically to handle the intense beams produced by a new cyclotron. Compared to its predecessor, it doubled the efficiency at catching the superheavy atoms produced in fusion reactions while cutting background noise by a factor of 200.4Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. DGFRS-2—A gas-filled recoil separator for the Dubna Super Heavy Element Factory Even with those improvements, the production rate for superheavy elements like moscovium remains on the order of atoms per week at best.
What Moscovium Actually Does When It Exists
The honest answer is that moscovium barely exists at all. The most commonly produced isotope, moscovium-288, has a half-life of roughly 170 milliseconds. Moscovium-290, the longest-lived known isotope, lasts a bit longer but still on the order of a fraction of a second. During that brief window, each atom undergoes alpha decay, ejecting a helium nucleus and transmuting into an atom of nihonium (element 113). That nihonium atom then decays again, and the process continues through a chain of lighter elements until the atom reaches a nucleus stable enough to persist or undergoes spontaneous fission, splitting apart entirely.
Researchers identify moscovium by detecting these decay chains. Each alpha particle carries a characteristic energy, so when a detector records a rapid sequence of alpha emissions with the right energies and timing, scientists can work backward to confirm that a moscovium atom was the starting point. This is how the Chinese CAFE2 team identified their 21 decay chains, and how every previous observation of element 115 has been confirmed.3Chinese Physics Letters. Production of 287,288 Mc isotopes in the 48 Ca + 243 Am reaction at China Accelerator Facility for Superheavy Elements
Because moscovium decays so quickly, no one has ever assembled enough of it to see, weigh, or hold. Any bulk properties like melting point, density, or electrical conductivity are entirely theoretical predictions based on where moscovium sits on the periodic table and what computational models say about its electronic structure. When you see a periodic table listing moscovium’s density as roughly 13.5 grams per cubic centimeter or its melting point around 400°C, those are educated guesses from relativistic calculations, not measurements.
Why Its Chemistry Is Strange
Moscovium sits in Group 15, below nitrogen, phosphorus, arsenic, antimony, and bismuth. If the periodic table’s patterns held perfectly, you would expect moscovium to behave like a heavier version of bismuth. It does not, at least not entirely, and the reason comes down to how fast its inner electrons are moving.
In superheavy elements, the electrons closest to the nucleus are traveling at a substantial fraction of the speed of light. At those velocities, the electrons gain relativistic mass, which contracts their orbitals and changes how the outer electrons arrange themselves. For moscovium, this means the outermost electrons behave differently from what you would predict by simply extending the trends of lighter Group 15 elements. The effect is not subtle: it reshapes the element’s bonding behavior, ionization energies, and how it interacts with surfaces.5PubMed Central. Manifestation of relativistic effects in the chemical properties of nihonium and moscovium revealed by gas chromatography studies
The most concrete experimental evidence of this came from gas chromatography studies that measured how strongly moscovium atoms stick to a silicon oxide surface. Researchers determined the adsorption enthalpy of moscovium on silicon oxide to be about 54 kilojoules per mole. For context, bismuth, the lighter element directly above moscovium on the periodic table, sticks more strongly to the same surface. Moscovium is, in a real chemical sense, less reactive with that surface than bismuth.5PubMed Central. Manifestation of relativistic effects in the chemical properties of nihonium and moscovium revealed by gas chromatography studies At the same time, moscovium turned out to be more reactive than flerovium (element 114), its neighbor one step to the left on the periodic table, whose electron shell is essentially closed and makes it chemically inert. So moscovium lands in a middle ground: less reactive than you’d naively expect from its group membership, but not as inert as its quasi-closed-shell neighbors.
These findings matched predictions from advanced relativistic quantum chemistry calculations, which is satisfying for theorists. It confirms that the periodic table’s organizing principles still hold at element 115, but with relativistic corrections that are large enough to measurably shift how the element behaves. That makes moscovium, along with its neighbor nihonium, one of the few superheavy elements where relativistic effects have been experimentally observed and quantified in a chemical property, not just predicted on a computer.
The Bob Lazar Connection
No discussion of element 115 is complete without addressing the reason most people have heard of it in the first place. In 1989, a man named Bob Lazar claimed in a series of television interviews that he had worked at a facility near Area 51 in Nevada where the U.S. government was reverse-engineering alien spacecraft. According to Lazar, these craft were powered by element 115, which he said could be used as a fuel source for an antimatter reactor that produced gravity waves for propulsion. At the time, element 115 had not been synthesized, so the claim had a tantalizing quality: he was naming an element that did not yet officially exist.
When moscovium was successfully synthesized in 2003, some of Lazar’s supporters treated the discovery as vindication. It was not. Lazar’s claims required a stable form of element 115 that could be machined into wedges and used as a long-duration fuel. Every isotope of moscovium that has been produced decays in well under a second. There is no known or theoretically predicted stable isotope. The concept of an “island of stability” does exist in nuclear physics, referring to a hypothesized region of the periodic table where certain superheavy nuclei might have much longer half-lives than their neighbors. But even the most optimistic theoretical models place the center of this island around elements 114 to 126, with the predicted “stable” isotopes still expected to have half-lives measured in minutes to perhaps years, not the geological timescales that would be needed for a usable fuel.
The properties Lazar described bear no resemblance to anything observed or predicted for moscovium. It does not produce gravity waves. It does not generate antimatter. It does not emit usable energy. The real element is a fleeting, intensely radioactive curiosity that disappears almost as soon as it forms. The pop-culture fame of “element 115” is built entirely on a narrative that predated the element’s actual discovery and has no connection to its real behavior.
What the Island of Stability Actually Predicts
The idea behind the island of stability is grounded in nuclear shell theory, which treats protons and neutrons inside a nucleus somewhat like electrons in an atom: certain “magic numbers” of protons or neutrons create especially tightly bound, stable configurations. For known elements, magic numbers like 2, 8, 20, 28, 50, 82, and 126 correspond to nuclei that are unusually resistant to decay. The hypothesis is that a similar magic number exists for superheavy elements, possibly around 114 protons and 184 neutrons, where nuclei would be significantly more stable than their immediate neighbors on the periodic table.
Moscovium, with 115 protons, is close to this predicted region, which is part of why some enthusiasts latch onto it. But closeness in proton number is not enough. The isotopes of moscovium that have been produced have neutron counts far below 184. Moscovium-288, the most commonly observed isotope, has 173 neutrons. Reaching the predicted island of stability would require producing far more neutron-rich isotopes, which current accelerator technology cannot easily achieve. The calcium-48 plus americium-243 reaction, the workhorse for moscovium production, simply does not produce nuclei with enough neutrons.
Even if an isotope of moscovium near the island of stability could be produced, the predicted enhancement in half-life is relative. “More stable” in this context might mean minutes instead of milliseconds, or possibly hours or years for the most favorable cases, not millennia or longer. The island of stability is a real and scientifically important concept, but it is about extending half-lives enough to study superheavy nuclei in more detail, not about producing materials you could hold in your hand.
Why Scientists Bother Making Something So Short-Lived
If moscovium vanishes almost instantly and has no practical applications, why spend years and millions of dollars producing it? The answer is that superheavy elements test fundamental theories of nuclear physics and chemistry at their extremes. Every new element produced provides data points that either confirm or challenge the models scientists use to understand how atomic nuclei hold together and how electrons arrange themselves around very heavy nuclei.
The gas chromatography experiments on moscovium are a good example. By measuring how strongly a single atom of moscovium interacts with a surface, researchers can test whether relativistic quantum chemistry calculations actually predict reality for elements this heavy. The fact that the measured adsorption enthalpy matched the theoretical prediction is a genuine scientific result: it means the computational tools physicists use to model superheavy elements are working.5PubMed Central. Manifestation of relativistic effects in the chemical properties of nihonium and moscovium revealed by gas chromatography studies If they had not matched, it would have signaled that something about how we model atomic physics at these extremes is wrong, which would be equally valuable information.
Moscovium also plays a role in the broader program of superheavy element research aimed at reaching the island of stability. Each new isotope produced, each decay chain measured, refines the nuclear models that predict where stability might be found and how to get there. The upgrades at facilities like Dubna’s Super Heavy Element Factory, with its dramatically improved separator,4Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. DGFRS-2—A gas-filled recoil separator for the Dubna Super Heavy Element Factory and the newly operational CAFE2 in China,3Chinese Physics Letters. Production of 287,288 Mc isotopes in the 48 Ca + 243 Am reaction at China Accelerator Facility for Superheavy Elements are all part of an effort to push production rates high enough that subtler nuclear properties can be studied. The science here is incremental and painstaking, but it probes some of the deepest questions about how matter organizes itself at scales just slightly beyond what nature assembles on its own.
Other Superheavy Elements in the Neighborhood
Moscovium does not exist in isolation on the periodic table. Its neighbors, nihonium (113), flerovium (114), livermorium (116), tennessine (117), and oganesson (118), are all synthetic superheavy elements produced by the same handful of laboratories using similar techniques. Each one tests a different corner of the same set of theories.
Flerovium, element 114, is particularly interesting in the context of moscovium’s chemistry. Flerovium is predicted to be extremely inert because of relativistic effects that contract and close its outermost electron shell, making it behave somewhat like a noble gas despite being in the same group as lead. The gas chromatography studies that measured moscovium’s surface interaction also measured nihonium’s, and both turned out to be more reactive than their closed-shell neighbors flerovium and copernicium (element 112), but less reactive than the lighter elements in their respective groups.5PubMed Central. Manifestation of relativistic effects in the chemical properties of nihonium and moscovium revealed by gas chromatography studies This layered picture, where each superheavy element’s chemistry is shaped by a unique interplay of relativistic effects and electron shell structure, is exactly the kind of nuanced data that makes the field worth pursuing.
Oganesson, element 118, sits at the bottom of the noble gas column and may not behave like a noble gas at all. Some predictions suggest it could be a solid at room temperature and might even be reactive, which would be unprecedented for an element in that group. These kinds of predictions remain untested because even fewer atoms of oganesson have been produced than moscovium. The entire bottom row of the periodic table is a landscape of open questions, and moscovium is one of the few elements there for which real chemical measurements exist.