Platinum

Transition metal · 195.08 u · group 10, period 6

Platinum · Pt

Atomic number78

SymbolPt

CategoryTransition metal

Standard stateSolid

Group · Period · Block10 · 6 · d

Electron configuration[Xe]6s1 4f14 5d9

Atomic mass195.08 u

Atomic radius209 pm

Protons / Neutrons / Electrons78 / 117 / 78

Shells (e⁻ per shell)2, 8, 18, 32, 17, 1

Electronegativity (Pauling)2.28

Ionization energy9 eV

Electron affinity2.128 eV

Oxidation states+4, +2

Melting point2.04e+3 K · 1.77e+3 °C

Boiling point4.10e+3 K · 3.82e+3 °C

Density21.46 g/cm³

Year discovered1735

CPK color

#D0D0E0

State at room temp (25 °C)

solid

Position

1 in library