---
title: "Copernicium (Cn): Atomic Mass, Electron Configuration & Properties"
url: https://www.moldraw.com/elements/copernicium.html
description: "Copernicium (Cn), element 112: atomic mass [285], electron configuration *[Rn] 5f¹⁴ 6d¹⁰ 7s², group 12, period 7, d-block transition metal. Melting and boiling point, density, electronegativity and shells."
lang: en
publisher: Scidart Academy
generated: 2026-11-03
---
112Cn[285]

# Copernicium (Cn) – element 112

Copernicium is a chemical element with the symbol **Cn** and atomic number **112**. It is a transition metal in group 12, period 7 of the periodic table (d-block), and is a liquid at room temperature.

Copernicium (Cn) has atomic number 112, atomic mass [285] and electron configuration *[Rn] 5f14 6d10 7s2.

[Download periodic table PDF](https://www.moldraw.com/printables/periodic-table.pdf)[Open interactive periodic table](https://www.moldraw.com/tools/free-chem-tools/interactive-periodic-table.html)

## Copernicium facts

| Symbol | Cn |
| --- | --- |
| Atomic number | 112 |
| Atomic mass | [285] |
| Category | transition metal |
| Group | group 12 |
| Period | 7 |
| Block | d-block |
| Phase at 20 °C | Liquid |
| Electron configuration | 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f14 6d10 |
| Noble-gas notation | *[Rn] 5f14 6d10 7s2 |
| Electrons per shell | 2, 8, 18, 32, 32, 18, 2 |

## Bohr model and shells

Copernicium has 112 electrons in 7 shells: 2, 8, 18, 32, 32, 18, 2. Full configuration and noble-gas notation are in the table; work out any element or ion with the [electron configuration calculator](https://www.moldraw.com/tools/free-chem-tools/electron-configuration-calculator.html).

## Physical and atomic properties

| Melting point | 283 K (9.9 °C) |
| --- | --- |
| Boiling point | 340 K (66.9 °C) |
| Density | 14 g/cm³ |
| Discovered by | Gesellschaft für Schwerionenforschung |

Use the atomic mass in the [molar mass calculator](https://www.moldraw.com/tools/free-chem-tools/molar-mass-calculator.html) for any formula containing Cn.

## Position in the periodic table

Tap any element to open its page.

## Frequently asked questions

### What is the atomic mass of copernicium?

The atomic mass of copernicium is [285] (mass number of its longest-lived isotope, since it has no stable isotope).

### What is the electron configuration of copernicium?

Copernicium has 112 electrons: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p⁶ 7s² 5f¹⁴ 6d¹⁰, or *[Rn] 5f¹⁴ 6d¹⁰ 7s² in noble-gas notation. Electrons per shell: 2, 8, 18, 32, 32, 18, 2.

### Is copernicium a metal?

Yes. Copernicium is a transition metal.

### Where is copernicium on the periodic table?

Copernicium is in group 12, period 7, in the d-block.

Data: [Periodic-Table-JSON](https://github.com/Bowserinator/Periodic-Table-JSON) (CC BY-SA 3.0); standard atomic weights from IUPAC (abridged). Values in brackets are the mass number of the longest-lived isotope.