Atomic Element Z = 78 • Transition Metal
Platinum (Pt) — Atomic Data, Electron Shells & Reactions
Platinum (symbol Pt, atomic number 78) has a standard atomic weight of 195.08 u and ground-state configuration [Xe] 4f14 5d9 6s1.
Atomic Number (Z)
78
IUPAC Symbol
Pt
Standard Atomic Weight
195.08 g/mol
Period / Group / Block
6 / 10 / d-block
Condensed Electron Config
[Xe] 4f14 5d9 6s1
Full Subshell Config
1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d9 6s1
Principal Shell Occupancy
[2, 8, 18, 32, 17, 1]
Pauling Electronegativity
2.28
First Ionization Energy
870 kJ/mol
Covalent Radius
136 pm
Melting Point
2041.4 K (1768.25 °C)
Boiling Point
4098 K (3824.85 °C)
Density
21.46 g/cm³
Oxidation States
+4, +2
Pt (Z=78) — Valence shell highlighted in vermilion