Bromine Electron Configuration
Orbital diagram
- Valence electrons
- 7
- Unpaired electrons
- 1
- Block
- p-block
- Magnetism (atom)
- paramagnetic
Electrons per shell
| K (n = 1) | 2 |
|---|---|
| L (n = 2) | 8 |
| M (n = 3) | 18 |
| N (n = 4) | 7 |
Bromine ion configurations
| Ion | Electrons | Configuration |
|---|---|---|
| Br− | 36 | [Ar] 3d10 4s2 4p6 |
How to write it
Place 35 electrons into subshells in the Aufbau order (1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5f, 6d, 7p), filling s with 2, p with 6, d with 10 and f with 14. Bromine sits in period 4, group 17, in the p-block, so its last electron enters a p subshell. Replacing the inner electrons with the previous noble gas gives the shorthand [Ar] 3d10 4s2 4p5.
Try bromine and its ions in the calculator, or see the full bromine data sheet.
Bromine electron configuration FAQ
What is the electron configuration of bromine?
1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁵. Shorthand (noble gas) notation: [Ar] 3d¹⁰ 4s² 4p⁵.
What is the noble gas configuration of bromine?
[Ar] 3d¹⁰ 4s² 4p⁵. The bracket stands for the Ar core electrons.
How many valence electrons does bromine have?
7 (outer shell (n = 4)).
How many unpaired electrons does bromine have?
1 in the ground state, following Hund’s rule. An atom with unpaired electrons is paramagnetic.
What is the electron configuration of Br−?
[Ar] 3d¹⁰ 4s² 4p⁶ (36 electrons).