Bromine

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Symbol:

Br

Atomic Number:

35

Relative Atomic Mass:

79.904 g mol^-1

Natural Abundance in Lithosphere, hydrosphere and atmosphere:

6 x 10^-4% (mass fraction)

Electron Configuration:

[Ar]3d¹⁰4s²4p⁵

Oxidation States:

VII, V, III, I, -I

Atomic Radius:

114.5pm

Covalent Radius:

114pm

Ionic Radius:

196pm (for -1 oxidation state)

Van der Waals Radius:

200pm

Boiling Point:

58.8°C

Density:

3.14 g cm^-3 (at 20°C)

First Ionisation Energy:

11.814 eV

Reduction Potential:

1.066V

for Br + e^- a Br^1-

Electronegativity (Allred and Rochow):

2.7

Number of Natural Isotopes:

2

Mass Number of the Most Abundant Isotopes:

79 g mol^-1 a 50.7% abundance

81 g mol^-1 a 49.3% abundance