platinum

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Symbol:

Pt

Atomic Number:

78

Relative Atomic Mass:

195.078 g mol^-1

Natural Abundance in Lithosphere, hydrosphere and atmosphere:

5 x 10^-7% (mass fraction)

Electron Configuration:

[Xe]4f¹⁴5d⁹6s

Oxidation States:

IV, II, 0

Atomic Radius:

137.3pm

Covalent Radius:

130pm

Ionic Radius:

63pm (for +4 oxidation state)

60pm (for +2 oxidation state)

Melting Point:

1772°C

Density:

21.45 g cm^-3 (at 20°C)

First Ionisation Energy:

9.0 eV

Reduction Potential:

1.118V

for Pt²⁺ + 2e^- a Pt_(s)

Electronegativity (Allred and Rochow):

1.4

Number of Natural Isotopes:

6

Mass Number of the Most Abundant Isotopes:

194 g mol^-1 a 33.0% abundance

195 g mol^-1 a 33.8% abundance

196 g mol^-1 a 25.2% abundance