iodine

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Symbol:

I

Atomic Number:

53

Relative Atomic Mass:

126.90447 g mol^-1

Natural Abundance in Lithosphere, hydrosphere and atmosphere:

6 x 10^-6% (mass fraction)

Electron Configuration:

[Kr]4d¹⁰5s²5p⁵

Oxidation States:

VII, V, I, -I

Atomic Radius:

133.1pm

Covalent Radius:

133pm

Ionic Radius:

220pm (for -1 oxidation state)

Van der Waals Radius:

220pm

Melting Point:

113.5°C

Density:

4.94 g cm^-3 (at 20°C)

First Ionisation Energy:

10.451 eV

Reduction Potential:

0.536V

for I + e^- a I^1-

Electronegativity (Allred and Rochow):

2.2

Number of Natural Isotopes:

1

Mass Number of the Most Abundant Isotopes:

127 g mol^-1 a 100% abundance