Platinum
Transition Metal
Platinum (Pt) is a chemical element with atomic number 78, classified as a transition metal. At room temperature it is a solid. It was discovered in 1735 by Antonio de Ulloa.
Properties
- Atomic number
- 78
- Atomic mass
- 195.08 u
- Category
- Transition Metal
- Group
- 10
- Period
- 6
- Block
- d-block
- Electron configuration
- [Xe] 4f¹⁴ 5d⁹ 6s¹
- Phase at STP
- Solid
- Density
- 21.46 g/cm³
- Melting point
- 2041.4 K (1768.3 °C)
- Boiling point
- 4098 K (3824.8 °C)
- Electronegativity
- 2.28
- Atomic radius
- 177 pm
- Ionization energy
- 8.959 eV
- Discovery
- 1735 · Antonio de Ulloa
Common uses
Catalytic converters, jewelry, electronics, cancer treatment
Did you know?
More valuable than gold and essential for reducing car emissions.
Experiment with the elements
Platinum doesn't form any compounds in our lab yet, but the periodic table sandbox lets you combine dozens of other real elements into real compounds — water, table salt, ammonia and many more — with their true chemical formulas.