radium

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Symbol:

Ra

Atomic Number:

88

Relative Atomic Mass:

226.0254 g mol^-1

Natural Abundance in Lithosphere, hydrosphere and atmosphere:

10^-10% (mass fraction)

Electron Configuration:

[Rn]7s²

Oxidation States:

II

Ionic Radius:

148pm (for +2 oxidation state, 8 coordinate)

170pm (for +2 oxidation state, 12 coordinate)

Melting Point:

700°C

Density:

5.50 g cm^-3 (at 20°C)

First Ionisation Energy:

5.279 eV

Reduction Potential:

-2.92V

for Ra²⁺ + 2e^- a Ra_(s)

Electronegativity (Allred and Rochow):

1.0

Number of Natural Isotopes:

4