cerium

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Symbol:

Ce

Atomic Number:

58

Relative Atomic Mass:

140.116 g mol^-1

Natural Abundance in Lithosphere, hydrosphere and atmosphere:

4 x 10^-3% (mass fraction)

Electron Configuration:

[Xe]4f²6s²

Oxidation States:

IV, III

Atomic Radius:

182.5pm

Covalent Radius:

165pm

Ionic Radius:

87pm (for +4 oxidation state)

101pm (for +3 oxidation state)

Melting Point:

798°C

Density:

6.77 g cm^-3 (at 20°C)

First Ionisation Energy:

5.47 eV

Reduction Potential:

-2.483V

for Ce³⁺ +3e^- a Ce_(s)

Electronegativity (Allred and Rochow):

1.1

Number of Natural Isotopes:

4

Mass Number of the Most Abundant Isotopes:

138 g mol^-1 a 0.3% abundance

140 g mol^-1 a 88.4% abundance

142 g mol^-1 a 11.1% abundance