Copernicium (Cn): Electron Configuration and Properties
Copernicium (Cn): Electron Configuration and Properties
Electron configuration [Rn] 7s2 5f14 6d10 · group 12 · period 7 · Ar [285]
Copernicium data
- Atomic number
- 112
- Relative atomic mass
- [285]
- Group
- 12
- Period
- 7
- Block
- d
- Category
- Transition metal
- Electron configuration
- [Rn] 7s2 5f14 6d10
- Full configuration
- 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f14 6d10
- Electrons per shell
- 2, 8, 18, 32, 32, 18, 2 (K L M N O P Q)
- Valence electrons
- 12
- Electronegativity (Pauling)
- no data
- First ionisation energy
- no data
- Atomic radius (van der Waals)
- no data
- State at room temperature
- Solid (predicted)
- Melting point
- no data
- Boiling point
- no data
- Density
- no data
- Common oxidation states
- +2, +1, 0
- Discovered
- 1996
Source: PubChem (NIH, accessed 13 Nov 2026); atomic mass: IUPAC standard atomic weight.
Electron shell diagram
K 2 · L 8 · M 18 · N 32 · O 32 · P 18 · Q 2
Orbital diagram (outer electrons)
About copernicium
With atomic number 112, copernicium (Cn) has 112 protons in its nucleus and 112 electrons as a neutral atom. It is a transition metal in group 12, period 7, d-block. Copernicium was first discovered in 1996. It is named after Nicolaus Copernicus. Its bulk properties have never been measured because only a few atoms have been made; it is expected to be a solid at room temperature.
Copernicium electron configuration
The electron configuration of copernicium is 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f14 6d10, or in short [Rn] 7s2 5f14 6d10. Its electrons occupy 7 shells: K = 2, L = 8, M = 18, N = 32, O = 32, P = 18, Q = 2. For transition metals, valence electrons are counted from the 7s and 6d subshells: 2 + 10 = 12, matching group 12. For this superheavy element the configuration is a theoretical prediction.
Filling order: 1s2(2) → 2s2(4) → 2p6(10) → 3s2(12) → 3p6(18) → 4s2(20) → 3d10(30) → 4p6(36) → 5s2(38) → 4d10(48) → 5p6(54) → 6s2(56) → 4f14(70) → 5d10(80) → 6p6(86) → 7s2(88) → 5f14(102) → 6d10(112)
Uses of copernicium
Copernicium has no practical use outside research, because it can only be made a few atoms at a time in particle accelerators.
Safety
Only a handful of copernicium atoms have ever been made and they decay very quickly, so it is never handled in an ordinary laboratory.
Other elements in group 12
Frequently asked questions
What is the electron configuration of copernicium?
The electron configuration of copernicium (Cn, atomic number 112) is 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f14 6d10, or [Rn] 7s2 5f14 6d10 in short. By shell: 2, 8, 18, 32, 32, 18, 2.
How many valence electrons does copernicium have?
Copernicium has 12 valence electrons.
Which group and period is copernicium in?
Copernicium is in group 12, period 7, d-block.
What is the atomic mass of copernicium?
Copernicium has no stable isotope, so the mass number of its longest-lived isotope, [285], is given.
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