Platinum (Pt)

From Wikipedia, the free encyclopediaPlatinum is a chemical element with symbol Pt and atomic number 78. It is a dense, malleable, ductile, highly unreactive, precious, gray-white transition metal. Its name is derived from the Spanish term platina, which is literally translated into "little silver".

Platinum in the periodic table

SymbolPt
Atomic number78
Group10
Period6
Blockd
Element categoryTransition Metal

Physical properties

Phase at STPSolid
Density21.45 g/cm3
Atomic weight195.085 u
Melting point2041.4 K
1768.25 °C
3214.85 °F
Boiling point4098 K
3824.85 °C
6916.73 °F

Atomära egenskaper

Electronegativity (Pauling Scale)2.28
Electron affinity205.041 kJ/mol
Ionization energies
1870 kJ/mol
2 1791 kJ/mol

Electron configuration

Electron configuration1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d9 6s1
Electrons per shell2, 8, 18, 32, 17, 1

History

Discovered1735
Discovered byAntonio de Ulloa