Beryllium

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Symbol:

Be

Atomic Number:

4

Relative Atomic Mass:

9.012182 g mol^-1

Natural Abundance in Lithosphere, hydrosphere and atmosphere:

5 x 10^-4% (mass fraction)

Electron Configuration:

[He]2s²

Oxidation States:

II

Atomic Radius:

111.3pm

Covalent Radius:

89pm

Ionic Radius:

27pm (for +2 oxidation state, 4 coordinate)

45pm (for +2 oxidation state, 6 coordinate)

Melting Point:

1278°C

Density:

1.85 g cm^-3 (at 20°C)

First Ionisation Energy:

9.322 eV

Reduction Potential:

-1.85V

for Be²⁺ +2e^- a Be_(s)

Electronegativity (Allred and Rochow):

1.5

Number of Natural Isotopes:

1

Mass Number of the Most Abundant Isotopes:

9 g mol^-1 a 100% abundance