terbium

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Symbol:

Tb

Atomic Number:

65

Relative Atomic Mass:

158.92534 g mol^-1

Natural Abundance in Lithosphere, hydrosphere and atmosphere:

9 x 10^-5% (mass fraction)

Electron Configuration:

[Xe]4f⁹6s²

Oxidation States:

IV, III

Atomic Radius:

176.3pm

Covalent Radius:

159pm

Ionic Radius:

92pm (for +3 oxidation state, 6 coordinate)

110pm (for +3 oxidation state, 9 coordinate)

Melting Point:

1360°C

Density:

8.25 g cm^-3 (at 20°C)

First Ionisation Energy:

5.85 eV

Reduction Potential:

-2.30V

for Tb³⁺ + 3e^- a Tb_(s)

Electronegativity (Allred and Rochow):

1.1

Number of Natural Isotopes:

1

Mass Number of the Most Abundant Isotopes:

159 g mol^-1 a 100% abundance