copper

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Symbol:

Cu

Atomic Number:

29

Relative Atomic Mass:

63.546 g mol^-1

Natural Abundance in Lithosphere, hydrosphere and atmosphere:

0.01% (mass fraction)

Electron Configuration:

[Ar]3d¹⁰4s

Oxidation States:

II, I

Atomic Radius:

127.8pm

Covalent Radius:

117pm

Ionic Radius:

57pm (for +2 oxidation state)

46pm (for +1 oxidation state)

Melting Point:

1083.4°C

Density:

8.92 g cm^-3 (at 20°C)

First Ionisation Energy:

7.726 eV

Reduction Potential:

0.342V

for Cu²⁺ + 2e^- a Cu_(s)

Electronegativity (Allred and Rochow):

1.8

Number of Natural Isotopes:

2

Mass Number of the Most Abundant Isotopes:

63 g mol^-1 a 69.2% abundance

65 g mol^-1 a 30.8% abundance