samarium

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Symbol:

Sm

Atomic Number:

62

Relative Atomic Mass:

150.36 g mol^-1

Natural Abundance in Lithosphere, hydrosphere and atmosphere:

6 x 10^-4% (mass fraction)

Electron Configuration:

[Xe]4f⁶6s²

Oxidation States:

III, II

Covalent Radius:

162pm

Ionic Radius:

96pm (for +3 oxidation state, 6 coordinate)

113pm (for +3 oxidation state, 9 coordinate)

132pm (for +2 oxidation state, 9 coordinate)

Melting Point:

1072°C

Density:

7.54 g cm^-3 (at 20°C)

First Ionisation Energy:

5.63 eV

Reduction Potential:

-2.30V

for Sm³⁺ + 3e^- a Sm_(s)

Electronegativity (Allred and Rochow):

1.1

Number of Natural Isotopes:

7

Mass Number of the Most Abundant Isotopes:

147 g mol^-1 a 15% abundance

152 g mol^-1 a 26.7% abundance

154 g mol^-1 a 22.7% abundance