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78Pt195.085
Platinum
Transition MetalPlatinum 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".
Phase: SolidAppearance: silvery white
2, 8, 18, 32, 17, 1
Physical Properties
Atomic Mass195.0849 u
Density21.45 g/cm³
Melting Point2041.4 K
Boiling Point4098 K
Molar Heat25.86 J/(mol·K)
Period6
PhaseSolid
Chemical Properties
Electron Configuration1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s1 4f14 5d9
Semantic Config[Xe] 4f14 5d9 6s1
Shells2, 8, 18, 32, 17, 1
Electron Affinity205.041 kJ/mol
Electronegativity2.28
Ionization Energies
IE1: 870 kJ/molIE2: 1791 kJ/mol
Discovery
Discovered byAntonio de Ulloa