---
title: "Copper (Cu): Atomic Mass, Electron Configuration & Properties"
url: https://www.moldraw.com/elements/copper.html
description: "Copper (Cu), element 29: atomic mass 63.546, electron configuration [Ar] 3d¹⁰ 4s¹, group 11, period 4, d-block transition metal. Melting and boiling point, density, electronegativity and shells."
lang: en
publisher: Scidart Academy
generated: 2026-11-03
---
29Cu63.546

# Copper (Cu) – element 29

Copper is a chemical element with the symbol **Cu** and atomic number **29**. It is a transition metal in group 11, period 4 of the periodic table (d-block), and is a solid at room temperature.

Copper (Cu) has atomic number 29, atomic mass 63.546 u and electron configuration [Ar] 3d10 4s1.

[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)

## Copper facts

| Symbol | Cu |
| --- | --- |
| Atomic number | 29 |
| Atomic mass | 63.546 u (g/mol) |
| Category | transition metal |
| Group | group 11 |
| Period | 4 |
| Block | d-block |
| Phase at 20 °C | Solid |
| Electron configuration | 1s2 2s2 2p6 3s2 3p6 4s1 3d10 |
| Noble-gas notation | [Ar] 3d10 4s1 |
| Electrons per shell | 2, 8, 18, 1 |

## Bohr model and shells

Copper has 29 electrons in 4 shells: 2, 8, 18, 1. 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 | 1357.77 K (1084.6 °C) |
| --- | --- |
| Boiling point | 2835 K (2561.8 °C) |
| Density | 8.96 g/cm³ |
| Electronegativity (Pauling) | 1.9 |
| Electron affinity | 119.235 kJ/mol |
| Ionization energies | 745.5, 1957.9, 3555 kJ/mol (1st, 2nd, 3rd) |
| Molar heat capacity | 24.44 J/(mol·K) |
| Discovered by | Middle East |

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 Cu.

## Position in the periodic table

Tap any element to open its page.

## Frequently asked questions

### What is the atomic mass of copper?

The atomic mass of copper is 63.546 u, so one mole of copper atoms weighs 63.546 g.

### What is the electron configuration of copper?

Copper has 29 electrons: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹ 3d¹⁰, or [Ar] 3d¹⁰ 4s¹ in noble-gas notation. Electrons per shell: 2, 8, 18, 1.

### Is copper a metal?

Yes. Copper is a transition metal.

### Where is copper on the periodic table?

Copper is in group 11, period 4, 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.