Element 78
Platinum (Pt)
Platinum (Pt) is element 78 of the periodic table, a transition metal in period 6, group 10 (d-block) with an atomic mass of 195.08 and is a solid at standard conditions.
At a glance
- Atomic number
- 78
- Symbol
- Pt
- Atomic mass
- 195.08 u
- Category
- Transition metals
- Period
- 6
- Group
- 10
- Block
- d-block
- Phase at STP
- solid
Electron structure
- Electron configuration
- 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d9 6s1
- Shorthand configuration
- [Xe] 4f14 5d9 6s1
- Electrons per shell
- 2, 8, 18, 32, 17, 1
- Oxidation states
- -3, -2, -1, +1, +2, +3, +4, +5, +6
Physical properties
- Melting point
- 2041.4 K
- Boiling point
- 4098 K
- Density
- 21.46 g/cm3
- Phase
- solid
Atomic properties
- Electronegativity (Pauling)
- 2.28
- Atomic radius
- 177 pm
- Covalent radius
- 136 pm
- Van der Waals radius
- 175 pm
- First ionization energy
- 870 kJ/mol
- Electron affinity
- 205 kJ/mol
Notable isotopes
| Isotope | Mass | Abundance | Stability |
|---|---|---|---|
| Pt-195 | 194.96479 | 33.83% | Stable |
Common uses
- Jewelry
- Catalytic converters
- Chemotherapy
- Electronics
Discovery
- Year
- 1735
- Discovered by
- Antonio de Ulloa
- Country
- Colombia