Antimony

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Symbol:

Sb

Atomic Number:

50

Relative Atomic Mass:

118.760 g mol^-1

Natural Abundance in Lithosphere, hydrosphere and atmosphere:

7 x 10^-5% (mass fraction)

Electron Configuration:

[Kr]4d¹⁰5s²5p³

Oxidation States:

V, III, -III

Atomic Radius:

145pm

Covalent Radius:

141pm

Ionic Radius:

60pm (for +5 oxidation state)

76pm (for +3 oxidation state)

Melting Point:

630.7°C

Density:

6.69 g cm^-3 (at 20°C)

First Ionisation Energy:

8.641 eV

Reduction Potential:

0.152V

for SbO_3/2 + 3H⁺ +3e^- a Sb_(s) + 3/2H₂O

Electronegativity (Allred and Rochow):

1.8

Number of Natural Isotopes:

2

Mass Number of the Most Abundant Isotopes:

121 g mol^-1 a 57.2% abundance

123 g mol^-1 a 42.8% abundance