Recognised as Chemical element
Copernicium
- Cn
- Z = 112
- element of unknown category
- No stable isotope
Copernicium (Cn) is element 112, an element of unknown category in period 7 and group 12. Its most stable isotope has mass number 285. Weights follow IUPAC standard atomic weights, 2021 revision.
Identity
SymbolCn
Mass number of the most stable isotope285this element has no stable isotope
Mass in kilograms4.7325363 × 10^-25
Categoryelement of unknown category
Group12
Period7
Blockd-block
Electrons in a neutral atom112
Neutrons in the most common isotope173≈
Electron configuration
Configuration1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹⁴ 5s² 5p⁶ 5d¹⁰ 5f¹⁴ 6s² 6p⁶ 6d¹⁰ 7s²predicted by the Madelung rule; no ground state has been measured
Noble gas shorthand[Rn] 5f¹⁴ 6d¹⁰ 7s²
Electrons per shell2, 8, 18, 32, 32, 18, 2K, L, M and outward
Electrons in the outer shell2
Unpaired electrons0Hund's rule; none unpaired, so the free atom is diamagnetic
Madelung ruleAssumeda prediction, not a measurement
Quantities
Molar mass285 g/mol
Mass of one mole285 grams
Atoms in one gram2.1130318 × 10^21
Mass of one atom4.7325363 × 10^-22 g
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