78Solid
Pt 195.084 Atomic mass · uTransition metals
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".
Discovery Ancient (Antonio de Ulloa)
K2L8M18N32O17P1
Physical properties
Values for the element in its standard state.
- Density
- 21.09g/cm³
- Melting point
- 2,041K
- Boiling point
- 4,098K
- Atomic radius
- 128pm
- Bonding type
- Metallic
- Molar heat
- 25.86J/(mol·K)
Inside the atom
Electron arrangement and the energy behind its behavior.
Full electron configuration
1s, 2 electrons; 2s, 2 electrons; 2p, 6 electrons; 3s, 2 electrons; 3p, 6 electrons; 3d, 10 electrons; 4s, 2 electrons; 4p, 6 electrons; 4d, 10 electrons; 5s, 2 electrons; 5p, 6 electrons; 4f, 14 electrons; 5d, 9 electrons; 6s, 1 electrons;
[Xe] represents 54 core electrons. The full view shows them explicitly.
78 electrons Orbital order preserved from source
- Electronegativity
- 2.28Pauling scale
- First ionization energy
- 870kJ/mol
- Electron affinity
- 205kJ/mol
- Van der Waals radius
- 175pm
Pt PlatinumAtomic number 78
870kJ/mol
Atomic numberGaps indicate unavailable data
About platinum
- Appearance
- Silvery white
- Discovery
- Ancient (Antonio de Ulloa)
- Data source
- Read the reference
A missing value means it is unavailable in this reference dataset. Values can vary with measurement method and conditions.