Moscovium / Ununpentium Element Facts

The chemical element moscovium is classed as a metal (other). It was discovered in 2003 by teams of scientists led by Yuri Oganessian and Ken Moody.

Accelerated calcium ion.
Ununpentium synthesis

Illustration of an accelerated calcium ion speeding into collision with an americium nucleus. Fusion of these nuclei produces moscovium/ununpentium. Image: LLNL


Data Zone

Classification: Moscovium / Ununpentium is an ‘other metal’ (presumed)
Atomic weight: (289), no stable isotopes
State: solid (presumed)
Melting point:
Boiling point:
Electrons: 115
Protons: 115
Neutrons in most abundant isotope: 174
Electron shells: 2, 8, 18, 32, 32, 18, 5
Electron configuration: [Rn] 5f14 6d10 7s2 7p3
Show more, including: Heats, Energies, Oxidation, Reactions, Compounds, Radii, Conductivities
Specific heat capacity
Heat of fusion
Heat of atomization
Heat of vaporization
1st ionization energy
2nd ionization energy
3rd ionization energy
Electron affinity
Minimum oxidation number
Min. common oxidation no.
Maximum oxidation number
Max. common oxidation no.
Electronegativity (Pauling Scale)
Polarizability volume
Reaction with air
Reaction with 15 M HNO3
Reaction with 6 M HCl
Reaction with 6 M NaOH
Atomic radius
Ionic radius (1+ ion)
Ionic radius (2+ ion)
Ionic radius (3+ ion)
Ionic radius (1- ion)
Ionic radius (2- ion)
Ionic radius (3- ion)
Thermal conductivity
Electrical conductivity
Freezing/Melting point:

Element 115 decay

Heavy elements 113 and 115 have been made by combining calcium-48 and amercium-243. Image: LLNL

Discovery of Moscovium / Ununpentium

Dr. Doug Stewart

Research scientists at the Joint Institute for Nuclear Research in Dubna, Russia and the Lawrence Livermore National Laboratory (LLNL), California first made element 115, moscovium, in Dubna, Russia in 2003. The work was a collaboration between science teams led by Yuri Oganessian and Ken Moody.

The discovery was formally accepted on December 30, 2015 by The International Union of Pure and Applied Chemistry (IUPAC) and The International Union of Pure and Applied Physics (IUPAP), and a new superheavy element took its place in the seventh row of the periodic table.

The reaction was a fusion of element 20 with element 95: calcium-48 with americium-243.

The experiment began on July 14, 2003 and ended on August 10, 2003.

Calcium ions were formed into a beam in a cyclotron (a particle accelerator) and fired at a target layer of americium deposited on titanium foil.

Four atoms of element 115 (moscovium) were produced, which alpha decayed producing element 113, (nihonium). (1)

The researchers stated that one atom of moscovium-287 was made, and three atoms of moscovium-288 were made. Further experiments and analysis later confirmed this result.

The element is named after Moscow in recognition of the contribution The JLNR played in the discovery of the element. Moscovium is expected to officially replace its temporary name, ununpentuim, later this year.

As a result of its position in the periodic table moscovium / ununpentium is expected to be classed as one of the “other metals” and to have similar properties to the metal bismuth.

IUPAC reviewed the evidence for the discovery of moscovium and in 2016 they said, ‘The 2010 jointly with the 2013 collaborations of Oganessian et al. have met the Criteria for discovery of the element with atomic number Z=115 in as much as the reproducibility of alpha chain energies and lifetimes of 289115 in a cross reaction comparison is very convincing.’

IUPAC has accepted the discoveries of element 113 (nihonium/ununtrium), element 114 (flerovium/ununquadium), element 115 (moscovium/ununpentium), element 116 (livermorium/ununhexium), element 117 (tennessine/ununseptium) and element 118 (oganesson/ununoctium), thus completing the seventh row of the periodic table.

Appearance and Characteristics

Harmful effects:

Moscovium / Ununpentium is harmful due to its radioactivity.


Moscovium / Ununpentium is a synthetic radioactive metal and has only been produced in minute amounts.

Uses of Moscovium

Moscovium / Ununpentium is of research interest only.

Abundance and Isotopes

Abundance earth’s crust: nil

Abundance solar system: parts per trillion by weight, parts per trillion by moles

Cost, pure: $ per 100g

Cost, bulk: $ per 100g

Source: Moscovium / Ununpentium can be produced by bombarding 243Am with 48Ca ions in a heavy ion accelerator.

Isotopes: Moscovium / Ununpentium has 4 isotopes, with mass numbers from 287 to 290. None are stable.


1. Lawrence Livermore National Laboratory , Livermore Scientists Team With Russia To Discover Elements 113 and 115.

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