Cn
Copernicium
Copernicium is a chemical element with the symbol Cn and atomic number 112. It has a mass number of 285, sits in period 7 and group 12, and is classified as a transition metal.
Properties
| Symbol | Cn |
|---|---|
| Atomic number | 112 |
| Mass number | 285 |
| Category | Transition metal |
| Group | 12 |
| Period | 7 |
| Electron configuration | [Rn] 5f14 6d10 7s2 |
| Outer-shell electrons | 2 |
The figure of 285 is a mass number rather than a measured atomic weight, because this element has no stable isotope.
Calculate with copernicium
- Molar mass of any formula containing it
- Electron configuration, including ions
- Effective nuclear charge by Slater's rules
- Average atomic mass from isotope abundances
Group 12
Atomic weights are the IUPAC 2021 standard values, abridged to the conventional five significant figures. Group, period, category and electron configuration are derived from the atomic number rather than stored, so they cannot drift out of step with it.