Periodic Table
35
Br
79.904
Bromine
HalogenOnly nonmetal liquid at RT; red-brown fuming; oxidising.
Electronic Configuration
[Ar] 3d¹⁰ 4s² 4p⁵or1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁵
Electron shells
2e⁻n=1
8e⁻n=2
18e⁻n=3
7e⁻n=4
Properties
Atomic number
35
Atomic mass
79.904 u
Category
Halogen
Block / Group / Period
p · 17 · 4
Valence electrons
7
Oxidation states
-1 to +7
Electronegativity
2.96
Atomic radius
94 pm
Ionization energy
1140 kJ/mol
Electron affinity
324 kJ/mol
Melting point
266 K / -7 °C
Boiling point
332 K / 59 °C
Density
3.122 g/cm³
State at 25 °C
liquid
Personal Notes
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