dysprosium

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Symbol:

Dy

Atomic Number:

66

Relative Atomic Mass:

162.50 g mol^-1

Natural Abundance in Lithosphere, hydrosphere and atmosphere:

4 x 10^-4% (mass fraction)

Electron Configuration:

[Xe]4f¹⁰6s²

Oxidation States:

III

Atomic Radius:

175.2pm

Covalent Radius:

159pm

Ionic Radius:

91pm (for +3 oxidation state, 6 coordinate)

108pm (for +3 oxidation state, 9 coordinate)

Melting Point:

1409°C

Density:

8.56 g cm^-3 (at 20°C)

First Ionisation Energy:

5.93 eV

Reduction Potential:

-2.29V

for Dy³⁺ + 3e^- a Dy_(s)

Electronegativity (Allred and Rochow):

1.1

Number of Natural Isotopes:

7

Mass Number of the Most Abundant Isotopes:

162 g mol^-1 a 25.5% abundance

163 g mol^-1 a 24.9% abundance

164 g mol^-1 a 28.2% abundance