rhenium

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Symbol:

Re

Atomic Number:

75

Relative Atomic Mass:

186.207 g mol^-1

Natural Abundance in Lithosphere, hydrosphere and atmosphere:

10^-7% (mass fraction)

Electron Configuration:

[Xe]4f¹⁴5d⁵6s²

Oxidation States:

VII, VI, IV, II, -I

Atomic Radius:

137.1pm

Covalent Radius:

128pm

Ionic Radius:

53pm (for +7 oxidation state)

63pm (for +4 oxidation state)

Melting Point:

3180°C

Density:

21.03 g cm^-3 (at 20°C)

First Ionisation Energy:

7.88 eV

Reduction Potential:

-0.251V

for ReO₂ + 4H⁺ + 4e^- a Re_(s) + 2H₂O

Electronegativity (Allred and Rochow):

1.5

Number of Natural Isotopes:

2

Mass Number of the Most Abundant Isotopes:

185 g mol^-1 a 37.4% abundance

187 g mol^-1 a 62.6% abundance