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Rhodium (Rh)

From Wikipedia, the free encyclopediaRhodium is a chemical element with symbol Rh and atomic number 45. It is a rare, silvery-white, hard, and chemically inert transition metal. It is a member of the platinum group.

Rhodium in the periodic table

SymbolRh
Atomic number45
Group9
Period5
Blockd
Element categoryTransition Metal

Physical properties

Phase at STPSolid
Density12.41 g/cm3
Atomic weight102.906 u
Melting point2237 K
1963.85 °C
3566.93 °F
Boiling point3968 K
3694.85 °C
6682.73 °F

Atomic properties

Electronegativity (Pauling Scale)2.28
Electron affinity110.27 kJ/mol
Oxidation states−3, −1, 0, +1, +2, +3, +4, +5, +6
(an amphoteric oxide)
Ionization energies
1719.7 kJ/mol
2 1740 kJ/mol
3 2997 kJ/mol

Electron configuration

Elektronkonfiguration (shorthand)[Kr] 4d8 5s1
Electron configuration1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d8 5s1
Electrons per shell2, 8, 18, 16, 1

History

Discovered1804
Discovered byWilliam Hyde Wollaston
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