Moscovium (Mc) — element 115post-transition metal · group 15, period 7
Moscovium is a chemical element with the symbol Mc and atomic number 115. It is a post-transition metal in group 15, period 7 of the periodic table (the p-block), with a standard atomic mass of [290] u. At room temperature (25 °C) moscovium is predicted to be a solid.
# Moscovium properties
| Symbol | Mc |
|---|---|
| Atomic number | 115 |
| Atomic mass | [290] u |
| Category | post-transition metal |
| Group | 15 |
| Period | 7 |
| Block | p-block |
| Electron configuration | [Rn] 5f¹⁴ 6d¹⁰ 7s² 7p³ |
| Full configuration | 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹⁴ 5s² 5p⁶ 5d¹⁰ 5f¹⁴ 6s² 6p⁶ 6d¹⁰ 7s² 7p³ |
| Electrons per shell | 2, 8, 18, 32, 32, 18, 5 |
| Protons / electrons | 115 / 115 |
| State at 25 °C | predicted solid |
| Melting point | 670 K (396.9 °C, 746.3 °F) (predicted) |
| Boiling point | 1400 K (1126.8 °C, 2060.3 °F) (predicted) |
| Density | 13.5 g/cm³ (predicted) |
| Electronegativity (Pauling) | — |
| First ionization energy | — |
| Atomic radius | — |
| Discovered | 2003 |
Values for superheavy elements are theoretical predictions; none have been measured in bulk.
# Electron configuration of moscovium
The electron configuration of moscovium is [Rn] 5f¹⁴ 6d¹⁰ 7s² 7p³, written out in full as 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹⁴ 5s² 5p⁶ 5d¹⁰ 5f¹⁴ 6s² 6p⁶ 6d¹⁰ 7s² 7p³. Its 115 electrons fill 7 shells as 2, 8, 18, 32, 32, 18, 5, so the outermost shell holds 5 electrons. As a group 15 element, moscovium has 5 valence electrons. Because only a few atoms have ever been made, this configuration is a theoretical prediction.