78
Pt
195.08
Platinum
Element 78 · 195.08 u · d-block
transition metal
A precious metal prized for jewelry and industry. Critical in catalytic converters, chemotherapy drugs, and fuel cells.
Phase (STP)
Solid
Melting Point
1768.3 °C
Boiling Point
3825 °C
Density
21.46 g/cm³
Electronegativity
2.28
Atomic Radius
135 pm
Ionization Energy
870 kJ/mol
Electron Affinity
205 kJ/mol
Discovered
1735 · Antonio de Ulloa
Electron Configuration
[Xe] 4f14 5d9 6s1
Electron Orbitals
Drag to rotate · Pinch to zoom