Cn
Copernicium
Element 112 · Transition metal
Copernicium (Cn)
Copernicium is a synthetic element in the same group as zinc, cadmium and mercury. It may be a volatile liquid or gas.
- Transition metal
- Period 7
- Group 12
- d-block
- solid at room temperature
- ☢ Radioactive
Key properties
- Atomic mass
- [286]
- u
- Electron configuration
- [Rn] 5f14 6d10 7s2
- Melting point
- 9.9 °C
- 283 K
- Boiling point
- 66.9 °C
- 340 K
- Density
- 14 g/cm³
- Electronegativity
- —
- Atomic radius
- —
- 1st ionisation energy
- —
Superheavy elements have only been made a few atoms at a time. Most properties shown are theoretical predictions.
Compare with every element:Electronegativity chartAtomic radius chartIonisation energy chartDensity chart of the elementsMelting point chartElectron configuration chart
Did you know?
Notable facts about copernicium
- 01
Its name was announced on Copernicus’s birthday, 19 February 2010.
- 02
Experiments show it is more volatile than mercury.
- 03
It may be the heaviest element that is liquid at room temperature.
Applications
What is copernicium used for?
- Research
History
Discovery & name origin
Discovered by
Year
Where
Germany
Name origin
From Nicolaus Copernicus.
Atomic structure
Atomic properties
Atomic structure
Atomic properties
- Atomic number
- 112
- Atomic mass
- [286] u
- Group
- 12
- Period
- 7
- Block
- d-block
- Electron configuration
- [Rn] 5f14 6d10 7s2
- 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
- Electronegativity (Pauling)
- —
- Electron affinity
- —
- Atomic radius (van der Waals)
- —
- Stable isotopes
- None — all isotopes are radioactive
Oxidation states
Highlighted: common oxidation states (+2, +1, 0).
Physical
Physical properties & colour
Physical
Physical properties & colour
- State at 20 °C
- Solid (predicted)
- Melting point
- 283 K · 9.9 °C · 49.7 °F
- Boiling point
- 340 K · 66.9 °C · 152.3 °F
- Density
- 14 g/cm³
- Molar heat capacity
- —
- Appearance
- —
- CPK model colour
- —
The CPK colour is the convention used for this element’s atoms in molecular models.
FAQ
Copernicium questions
What is Cn on the periodic table?
Cn is the symbol for copernicium, element 112 on the periodic table. It sits in group 12, period 7, in the transition metal category, and has an atomic mass of [286].
What is the atomic number of copernicium?
Copernicium has atomic number 112, so every copernicium atom has 112 protons in its nucleus. Its symbol is Cn and its atomic mass is [286].
Who discovered copernicium?
Copernicium was discovered by Sigurd Hofmann and Peter Armbruster in 1996 (Germany). The name comes from from Nicolaus Copernicus.
What is copernicium used for?
Copernicium is used for: research.
Is copernicium a metal?
Yes. Copernicium is a transition metal, one of the metallic elements.
What is the electron configuration of copernicium?
The electron configuration of copernicium is [Rn] 5f14 6d10 7s2 (predicted). Its 112 electrons are arranged in shells as 2, 8, 18, 32, 32, 18, 2.