35Br79.904
Bromine
HalogensBlock pPeriod 4Group 17liquid at 20 °C
- Configuration :
- [Ar] 3d¹⁰ 4s² 4p⁵
- Atomic mass :
- 79.904 u
- French :
- Brome
3D Bohr-model representation of the Bromine atom (symbol Br, atomic number Z=35). Electron shell configuration: 2, 8, 18, 7 electrons.
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Bohr model · educational
Bohr model of bromine
Bromine (Br) has 35 electrons, spread over 4 shells. The diagram places them on circles around the nucleus, from the K shell — the closest — outward.
| Shell | Electrons |
|---|---|
| K (n = 1) | 2 |
| L (n = 2) | 8 |
| M (n = 3) | 18 |
| N (n = 4) | 7 |
The Bohr model is a teaching picture: electrons do not travel in circular orbits, but the number of electrons per shell is exact.
Related lesson
Addition, substitution, elimination
Three major organic reaction categories. Examples: double-bond addition, halogenation, dehydration.
12 minElectron configuration
Full1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁵
Short[Ar] 3d¹⁰ 4s² 4p⁵
Valence electrons7
KLMNOPQ shells
K2
L8
M18
N7
Electronegativity
Pauling2.96
Allen2.685
Mulliken (eV)—
Atomic radii
Empirical115 pm
Calculated94 pm
Covalent120 pm
Van der Waals185 pm
Ionic radii (Shannon-Prewitt)
-1196 pm
Successive ionisation energies
I₁1139.9 kJ/mol
I₂2103 kJ/mol
I₃3470 kJ/mol
I₄4560 kJ/mol
I₅5760 kJ/mol
Electron affinity324.6 kJ/mol
Oxidation states
-1+1+3+4+5+7
Bold states = most common.
Warm-up
Bromine — do you remember?
3 questions on this page. The right answer shows every time, and nothing is asked of you to play.
No account · one minute