The orbital diagram for a bromine atom, which has an atomic number of 35, illustrates how the electrons are arranged in the various atomic orbitals.
Bromine has a total of 35 electrons, and its electron configuration is:
- 1s²
- 2s²
- 2p⁶
- 3s²
- 3p⁶
- 4s²
- 3d¹⁰
- 4p⁵
This can be represented in the orbital diagram as follows:
1s: ↑↓ 2s: ↑↓ 2p: ↑↓ ↑↓ ↑↓ 3s: ↑↓ 3p: ↑↓ ↑↓ ↑↓ 4s: ↑↓ 3d: ↑↓ ↑↓ ↑↓ ↑↓ ↑↓ 4p: ↑↓ ↑ ↑
In the diagram, each box represents an atomic orbital, and the arrows indicate the spin of the electrons: up for +1/2 and down for -1/2. Bromine has two electrons in the 4p orbital, which gives it its unique chemical properties, being one of the halogens.