Element 112
Copernicium (Cn)
Copernicium (Cn) is element 112 of the periodic table, a element with unclassified properties in period 7, group 12 (d-block) with an atomic mass of 285 and is a gas at standard conditions.
At a glance
- Atomic number
- 112
- Symbol
- Cn
- Atomic mass
- 285 u
- Category
- Unclassified properties
- Period
- 7
- Group
- 12
- Block
- d-block
- Phase at STP
- gas
Electron structure
- Electron configuration
- 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s2 6p6 5f14 6d10 7s2
- Shorthand configuration
- [Rn] 5f14 6d10 7s2
- Electrons per shell
- 2, 8, 18, 32, 32, 18, 2
- Oxidation states
- +2
Physical properties
- Boiling point
- 357 K
- Density
- 23.7 g/cm3
- Phase
- gas
Atomic properties
- Covalent radius
- 122 pm
- First ionization energy
- 1155 kJ/mol
Notable isotopes
| Isotope | Mass | Abundance | Stability |
|---|---|---|---|
| Cn-285 | 285.17712 | — | Half-life 28 seconds |
Common uses
- Scientific research only
Discovery
- Year
- 1996
- Discovered by
- Sigurd Hofmann
- Country
- Germany