holmium

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Symbol:

Ho

Atomic Number:

67

Relative Atomic Mass:

164.93032 g mol^-1

Natural Abundance in Lithosphere, hydrosphere and atmosphere:

10^-4% (mass fraction)

Electron Configuration:

[Xe]4f¹¹6s²

Oxidation States:

III

Atomic Radius:

174.3pm

Covalent Radius:

158pm

Ionic Radius:

90pm (for +3 oxidation state, 6 coordinate)

107pm (for +3 oxidation state, 9 coordinate)

Melting Point:

1470°C

Density:

8.78 g cm^-3 (at 20°C)

First Ionisation Energy:

6.02 eV

Reduction Potential:

-2.33V

for Ho³⁺ +3e^- a Ho_(s)

Electronegativity (Allred and Rochow):

1.1

Number of Natural Isotopes:

1

Mass Number of the Most Abundant Isotopes:

165 g mol^-1 a 100% abundance