Palladium (Pd)

From Wikipedia, the free encyclopediaPalladium is a chemical element with symbol Pd and atomic number 46. It is a rare and lustrous silvery-white metal discovered in 1803 by William Hyde Wollaston. He named it after the asteroid Pallas, which was itself named after the epithet of the Greek goddess Athena, acquired by her when she slew Pallas.

Palladium in the periodic table

SymbolPd
Atomic number46
Group10
Period5
Blockd
Element categoryTransition Metal

Physical properties

Phase at STPSolid
Density12.023 g/cm3
Atomic weight106.421 u
Melting point1828.05 K
1554.9 °C
2830.82 °F
Boiling point3236 K
2962.85 °C
5365.13 °F

Atomära egenskaper

Electronegativity (Pauling Scale)2.2
Electron affinity54.24 kJ/mol
Ionization energies
1804.4 kJ/mol
2 1870 kJ/mol
3 3177 kJ/mol

Electron configuration

Electron configuration1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10
Electrons per shell2, 8, 18, 18

History

Discovered1802
Discovered byWilliam Hyde Wollaston