---
title: "Manganese (Mn): Atomic Mass, Electron Configuration & Properties"
url: https://www.moldraw.com/elements/manganese.html
description: "Manganese (Mn), element 25: atomic mass 54.938, electron configuration [Ar] 3d⁵ 4s², group 7, period 4, d-block transition metal. Melting and boiling point, density, electronegativity and shells."
lang: en
publisher: Scidart Academy
generated: 2026-11-03
---
25Mn54.938

# Manganese (Mn) – element 25

Manganese is a chemical element with the symbol **Mn** and atomic number **25**. It is a transition metal in group 7, period 4 of the periodic table (d-block), and is a solid at room temperature.

Manganese (Mn) has atomic number 25, atomic mass 54.938 u and electron configuration [Ar] 3d5 4s2.

[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)

## Manganese facts

| Symbol | Mn |
| --- | --- |
| Atomic number | 25 |
| Atomic mass | 54.938 u (g/mol) |
| Category | transition metal |
| Group | group 7 |
| Period | 4 |
| Block | d-block |
| Phase at 20 °C | Solid |
| Electron configuration | 1s2 2s2 2p6 3s2 3p6 4s2 3d5 |
| Noble-gas notation | [Ar] 3d5 4s2 |
| Electrons per shell | 2, 8, 13, 2 |

## Bohr model and shells

Manganese has 25 electrons in 4 shells: 2, 8, 13, 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 | 1519 K (1245.8 °C) |
| --- | --- |
| Boiling point | 2334 K (2060.8 °C) |
| Density | 7.21 g/cm³ |
| Electronegativity (Pauling) | 1.55 |
| Electron affinity | -50 kJ/mol |
| Ionization energies | 717.3, 1509, 3248 kJ/mol (1st, 2nd, 3rd) |
| Molar heat capacity | 26.32 J/(mol·K) |
| Discovered by | Torbern Olof Bergman |

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 Mn.

## Position in the periodic table

Tap any element to open its page.

## Frequently asked questions

### What is the atomic mass of manganese?

The atomic mass of manganese is 54.938 u, so one mole of manganese atoms weighs 54.938 g.

### What is the electron configuration of manganese?

Manganese has 25 electrons: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁵, or [Ar] 3d⁵ 4s² in noble-gas notation. Electrons per shell: 2, 8, 13, 2.

### Is manganese a metal?

Yes. Manganese is a transition metal.

### Where is manganese on the periodic table?

Manganese is in group 7, 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.