uranium

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Symbol:

U

Atomic Number:

92

Relative Atomic Mass:

238.0289 g mol^-1

Natural Abundance in Lithosphere, hydrosphere and atmosphere:

3 x 10^-4% (mass fraction)

Electron Configuration:

[Rn]5f³6d7s²

Oxidation States:

VI, V, IV, III

Atomic Radius:

138.5pm

Covalent Radius:

142pm

Ionic Radius:

73pm (for +6 oxidation state)

89pm (for +4 oxidation state)

Melting Point:

1132.3°C

Density:

18.97 g cm^-3 (at 20°C)

First Ionisation Energy:

6.08 eV

Reduction Potential:

-1.798V

for U³⁺ + 3e^- a U_(s)

Electronegativity (Allred and Rochow):

1.2

Number of Natural Isotopes:

3

Mass Number of the Most Abundant Isotopes:

234 g mol^-1 a 0.005% abundance

235 g mol^-1 a 0.72% abundance

238 g mol^-1 a 99.275% abundance