112Cn[285]
Copernicium (Cn)
Element 112 · Transition metal
Copernicium (Cn) is a chemical element with atomic number 112. It is classified as a transition metal in period 7, group 12 of the periodic table (the d-block). Its most stable known isotope has mass number 285 and its ground-state electron configuration is [Rn] 5f¹⁴ 6d¹⁰ 7s². Its properties are largely predicted, as only a few atoms have ever been produced.
Copernicium facts
| Atomic number (Z) | 112 |
|---|---|
| Symbol | Cn |
| Mass number of most stable isotope | [285] |
| Category | Transition metal |
| Group | 12 |
| Period | 7 |
| Block | d-block |
| Electron configuration | [Rn] 5f¹⁴ 6d¹⁰ 7s² |
| Electronegativity (Pauling) | — |
| State at 20 °C | Unknown (synthetic) |
| Protons / electrons | 112 / 112 |
| Neutrons (most common isotope, approx.) | 173 |
| Molar mass | 285 g/mol |