78PtPlatinum195.0849[Xe] 4f¹⁴ 5d⁹ 6s¹
transition metal
Platinum
Platinum 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".
A stylized shell model. Electrons are quantum objects, not particles following these literal paths. Sizes and motion are illustrative.
Electrons by shell
Electron configuration
4f14
5d9
6s1
54 is the [Xe] core total across five shells.
At a glance
- Atomic number
- 78
- Atomic mass
- 195.0849 u
- Phase
- Solid
- Density
- 21.45 g/cm³
- Melting point
- 2,041.4 K
- Boiling point
- 4,098 K
- First ionization energy
- 870 kJ/mol
- Electronegativity
- 2.28
- Electron affinity
- 205.041 kJ/mol
- Molar heat capacity
- 25.86 J/(mol·K)
- Period
- 6
- Appearance
- silvery white
Conditions and isotopes affect measured properties. Some properties of short-lived elements are predicted. Electronegativity uses the Pauling scale.
Keep exploring
Explore the stories, imagery, and reference data in more depth. Properties with no value in the reference are marked unavailable.