112 - Copernicium transition metal
Discovered by Gesellschaft für Schwerionenforschung in 1996
Copernicium is a chemical element with symbol Cn and atomic number 112. It is an extremely radioactive synthetic element that can only be created in a laboratory. The most stable known isotope, copernicium-285, has a half-life of approximately 29 seconds, but it is possible that this copernicium isotope may have a nuclear isomer with a longer half-life, 8.9 min.
Periodic table
| Shell | Electrons | Orbitals |
|---|---|---|
| 1 | 2 | 2 in 1s |
| 2 | 8 | 2 in 2s + 6 in 2p |
| 3 | 18 | 2 in 3s + 6 in 3p + 10 in 3d |
| 4 | 32 | 2 in 4s + 6 in 4p + 10 in 4d + 14 in 4f |
| 5 | 32 | 2 in 5s + 6 in 5p + 10 in 5d + 14 in 5f |
| 6 | 18 | 2 in 6s + 6 in 6p + 10 in 6d |
| 7 | 2 | 2 in 7s |
Electron shells
285 u Atomic Mass
12 Group
23.7 g/cm³ Density
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f14 6d10 Electron Configuration
*[Rn] 5f14 6d10 7s2 Electron Configuration (semantic)
112 Electrons
7 Number of Shells
173 Neutrons
112 Atomic Number
7 Period
Solid Phase
112 Protons