ElementsWhat is moscovium?
Moscovium is a radioactive element made in particle accelerators. Its atoms last less than a second.
What is moscovium used for?
Research only.
Where the name comes from
From the Moscow region of Russia, where it was first made. The name was approved in 2016.
Key facts
- Symbol
- Mc
- Atomic number
- 115
- Atomic mass
- 290.196 u
- Family
- Post-transition metal
- Period
- 7
- Group
- 15
- Block
- p
- State at room temperature
- Solid (expected)
- Melting point
- not measured
- Boiling point
- not measured
- Density
- not measured
- Electrons per shell
- 2, 8, 18, 32, 32, 18, 5
- Electron configuration
- [Rn]7s2 7p3 5f14 6d10
- Common oxidation states
- 3, 1
- Electronegativity (Pauling)
- no value
- First ionisation energy
- not measured
- Electron affinity
- no value
- Atomic radius (van der Waals)
- no value
- Discovered
- 2003
Place in the periodic table
Moscovium is element number 115. It sits in period 7 (row 7) of the periodic table, in group 15 (column 15), and belongs to the p-block. Just before it comes flerovium (114), and just after it comes livermorium (116). In the same column, bismuth is above it. Elements in one column tend to behave alike.
Family: Post-transition metals.
Physical properties
Too few atoms of moscovium have been made to measure its bulk properties. It is expected to be a solid at room temperature.
Inside the atom
An atom of moscovium has 115 protons in its nucleus and, when neutral, 115 electrons around it. The electrons are arranged in 7 shells: 2, 8, 18, 32, 32, 18, 5. The outermost shell holds 5 electrons. Written in full, the electron configuration is [Rn]7s2 7p3 5f14 6d10 (predicted).
One mole of moscovium weighs 290.196 grams, so a single gram contains about 2.08 × 1021 atoms.
The ring picture is a simple model that only counts the electrons in each shell. Real atoms do not look like this.
Next steps
- Work out the weight of a compound that contains moscovium with the molar mass calculator.
- Compare it with every other element in the sortable list.
- Test yourself with the symbol quiz.
Figures on this page are from PubChem (U.S. National Library of Medicine), as downloaded on 11 November 2026. See About and data sources.