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78Pt195.084

Platinum

Transition metalsBlock dPeriod 6Group 10solid at 20 °C
Configuration :
[Xe] 4f¹⁴ 5d⁹ 6s¹
Atomic mass :
195.084 u
French :
Platine
3D Bohr-model representation of the Platinum atom (symbol Pt, atomic number Z=78). Electron shell configuration: 2, 8, 18, 32, 17, 1 electrons.
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Catalysis

Catalyst, activation energy, energy profile. Homogeneous, heterogeneous, enzymatic catalysis.

11 min
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Electron configuration

Full1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 5s² 5p⁶ 4f¹⁴ 5d⁹ 6s¹
Short[Xe] 4f¹⁴ 5d⁹ 6s¹
Valence electrons10
KLMNOPQ shells
K2
L8
M18
N32
O17
P1

Electronegativity

Pauling2.28
Allen
Mulliken (eV)

Atomic radii

Empirical135 pm
Calculated177 pm
Covalent136 pm
Van der Waals175 pm
Ionic radii (Shannon-Prewitt)
+462.5 pm

Successive ionisation energies

I₁870 kJ/mol
I₂1791 kJ/mol
Electron affinity205.3 kJ/mol

Oxidation states

-3-2-10+1+2+3+4+5+6
Bold states = most common.
Period 6Block dIUPAC Group 10Family Transition metals
Sources : NIST Atomic Weights & Isotopic Compositions, IUPAC Recommendations, CODATA. Methodology