Is copernicium a metal?

Copernicium's chemical category has not been confirmed by experiment, so it is listed with unclassified properties.

How many protons does copernicium have?

Copernicium has 112 protons. Its atomic number is 112, which is also the number of electrons in a neutral atom of copernicium.

What group and period is copernicium in?

Copernicium is in group 12 and period 7 of the periodic table, in the d-block.

What is the atomic mass of copernicium?

The atomic mass of copernicium is 285 u (unified atomic mass units).

Element 112

Copernicium (Cn)

Element with unclassified properties · Period 7 · Group 12 · d-block

Copernicium (Cn) is element 112 of the periodic table, an element with unclassified properties in period 7, group 12 (d-block) with an atomic mass of 285 and is a gas at standard conditions.

At a glance

Atomic number: 112
Symbol: Cn
Atomic mass: 285 u
Category: Unclassified properties
Period: 7
Group: 12
Block: d-block
Phase at STP: gas

Electron structure

Electron configuration: 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s2 6p6 5f14 6d10 7s2
Shorthand configuration: [Rn] 5f14 6d10 7s2
Electrons per shell: 2, 8, 18, 32, 32, 18, 2
Oxidation states: +2

Physical properties

Copernicium has only ever been produced in quantities too small to weigh or observe in bulk. The physical and atomic values below are theoretical predictions from periodic trends and relativistic calculations, not measurements.

Boiling point: 357 K (83.85 °C) (predicted)
Density: 23.7 g/cm³ (predicted)
Phase: gas

Atomic properties

Covalent radius: 122 pm (predicted)
First ionization energy: 1155 kJ/mol (predicted)

Notable isotopes

Notable isotopes of Copernicium: mass number, atomic mass, natural abundance, and stability.
Isotope	Mass	Abundance	Stability
Cn-285	285.17712	-	Half-life 28 seconds

Common uses

Scientific research only

Discovery

Year: 1996
Discovered by: Sigurd Hofmann
Country: Germany

Frequently asked questions

Is copernicium a metal?: Copernicium's chemical category has not been confirmed by experiment, so it is listed with unclassified properties.
How many protons does copernicium have?: Copernicium has 112 protons. Its atomic number is 112, which is also the number of electrons in a neutral atom of copernicium.
What group and period is copernicium in?: Copernicium is in group 12 and period 7 of the periodic table, in the d-block.
What is the atomic mass of copernicium?: The atomic mass of copernicium is 285 u (unified atomic mass units).

Keep exploring

Copernicium's row is on the printable element property sheet, and its tile is on the periodic table wall chart - the same numbers as above, laid out for A4 or A3 paper.