Atomic Element Z = 35 • Halogen
Bromine (Br) — Atomic Data, Electron Shells & Reactions
Bromine (symbol Br, atomic number 35) has a standard atomic weight of 79.904 u and ground-state configuration [Ar] 3d10 4s2 4p5.
Atomic Number (Z)
35
IUPAC Symbol
Br
Standard Atomic Weight
79.904 g/mol
Period / Group / Block
4 / 17 / p-block
Condensed Electron Config
[Ar] 3d10 4s2 4p5
Full Subshell Config
1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p5
Principal Shell Occupancy
[2, 8, 18, 7]
Pauling Electronegativity
2.96
First Ionization Energy
1140 kJ/mol
Covalent Radius
120 pm
Melting Point
265.8 K (-7.35 °C)
Boiling Point
332 K (58.85 °C)
Density
3.122 g/cm³
Oxidation States
+5, +1, -1
Br (Z=35) — Valence shell highlighted in vermilion