Iridium Gold

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

Symbol

Atomic number

Group

Period

Block

Element category

Transition Metal

Physical properties

Phase at STP

Solid

Density

21.45 g/cm³

Atomic weight

195.085 u

Melting point

2041.4 K
1768.25 °C
3214.85 °F

Boiling point

4098 K
3824.85 °C
6916.73 °F

Atomic properties

Electronegativity (Pauling Scale)

2.28

Electron affinity

205.041 kJ/mol

Oxidation states

−3, −2, −1, 0, +1, +2, +3, +4, +5, +6
(a mildly basic oxide)

Ionization energies

1	870 kJ/mol
2	1791 kJ/mol

Electron configuration

Elektronkonfiguration (shorthand)

[Xe] 4f¹⁴ 5d⁹ 6s¹

Electron configuration

1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹⁴ 5s² 5p⁶ 5d⁹ 6s¹

Electrons per shell

2, 8, 18, 32, 17, 1

History

Discovered

1735

Discovered by

Antonio de Ulloa