ytterbium

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Symbol:

Yb

Atomic Number:

70

Relative Atomic Mass:

173.04 g mol^-1

Natural Abundance in Lithosphere, hydrosphere and atmosphere:

3 x 10^-4% (mass fraction)

Electron Configuration:

[Xe]4f¹⁴6s²

Oxidation States:

III, II

Atomic Radius:

194pm

Covalent Radius:

174pm

Ionic Radius:

87pm (for +3 oxidation state, 6 coordinate)

104pm (for +3 oxidation state, 9 coordinate)

Melting Point:

824°C

Density:

6.97 g cm^-3 (at 20°C)

First Ionisation Energy:

6.254 eV

Reduction Potential:

-2.22V

for Yb³⁺ + 3e^- a Yb_(s)

Electronegativity (Allred and Rochow):

1.1

Number of Natural Isotopes:

7

Mass Number of the Most Abundant Isotopes:

172 g mol^-1 a 21.9% abundance

173 g mol^-1 a 16.1% abundance

174 g mol^-1 a 31.8% abundance