---
title: "Bismuth (Bi): Atomic Mass, Electron Configuration & Properties"
url: https://www.moldraw.com/elements/bismuth.html
description: "Bismuth (Bi), element 83: atomic mass 208.98, electron configuration [Xe] 4f¹⁴ 5d¹⁰ 6s² 6p³, group 15, period 6, p-block post-transition metal. Melting and boiling point, density, electronegativity and shells."
lang: en
publisher: Scidart Academy
generated: 2026-11-03
---
83Bi208.98

# Bismuth (Bi) – element 83

Bismuth is a chemical element with the symbol **Bi** and atomic number **83**. It is a post-transition metal in group 15 (pnictogens), period 6 of the periodic table (p-block), and is a solid at room temperature.

Bismuth (Bi) has atomic number 83, atomic mass 208.98 u and electron configuration [Xe] 4f14 5d10 6s2 6p3.

[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)

## Bismuth facts

| Symbol | Bi |
| --- | --- |
| Atomic number | 83 |
| Atomic mass | 208.98 u (g/mol) |
| Category | post-transition metal |
| Group | group 15 (pnictogens) |
| Period | 6 |
| Block | p-block |
| Phase at 20 °C | Solid |
| Electron configuration | 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p3 |
| Noble-gas notation | [Xe] 4f14 5d10 6s2 6p3 |
| Electrons per shell | 2, 8, 18, 32, 18, 5 |
| Valence electrons | 5 |

## Bohr model and shells

Bismuth has 83 electrons in 6 shells: 2, 8, 18, 32, 18, 5. 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 | 544.7 K (271.6 °C) |
| --- | --- |
| Boiling point | 1837 K (1563.8 °C) |
| Density | 9.78 g/cm³ |
| Electronegativity (Pauling) | 2.02 |
| Electron affinity | 90.924 kJ/mol |
| Ionization energies | 703, 1610, 2466 kJ/mol (1st, 2nd, 3rd) |
| Molar heat capacity | 25.52 J/(mol·K) |
| Discovered by | Claude François Geoffroy |

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 Bi.

## Position in the periodic table

Tap any element to open its page.

## Frequently asked questions

### What is the atomic mass of bismuth?

The atomic mass of bismuth is 208.98 u, so one mole of bismuth atoms weighs 208.98 g.

### What is the electron configuration of bismuth?

Bismuth has 83 electrons: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p³, or [Xe] 4f¹⁴ 5d¹⁰ 6s² 6p³ in noble-gas notation. Electrons per shell: 2, 8, 18, 32, 18, 5.

### How many valence electrons does bismuth have?

Bismuth has 5 valence electrons (group 15).

### Is bismuth a metal?

Yes. Bismuth is a post-transition metal.

### Where is bismuth on the periodic table?

Bismuth is in group 15 (pnictogens), period 6, in the p-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.