europium

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Symbol:

Eu

Atomic Number:

63

Relative Atomic Mass:

151.964 g mol^-1

Natural Abundance in Lithosphere, hydrosphere and atmosphere:

10^-5% (mass fraction)

Electron Configuration:

[Xe]4f⁷6s²

Oxidation States:

III, II

Atomic Radius:

199.5pm

Covalent Radius:

185pm

Ionic Radius:

95pm (for +3 oxidation state)

117pm (for +2 oxidation state)

Melting Point:

822°C

Density:

5.25 g cm^-3 (at 20°C)

First Ionisation Energy:

5.67 eV

Reduction Potential:

-2.407V

for Eu³⁺ +3e^- a Eu_(s)

Electronegativity (Allred and Rochow):

1.0

Number of Natural Isotopes:

2

Mass Number of the Most Abundant Isotopes:

151 g mol^-1 a 47.8% abundance

153 g mol^-1 a 52.2% abundance