francium

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Symbol:

Fr

Atomic Number:

87

Relative Atomic Mass:

223.0197 g mol^-1

Natural Abundance in Lithosphere, hydrosphere and atmosphere:

10^-21% (mass fraction)

Electron Configuration:

[Rn]7s

Oxidation States:

I

Ionic Radius:

180pm (for +1 oxidation state)

Melting Point:

27°C

First Ionisation Energy:

4.0 eV

Electronegativity (Allred and Rochow):

0.9

Number of Natural Isotopes:

1

Mass Number of the Most Abundant Isotopes:

223 g mol^-1 a 100% abundance