84 Po 209
Polonium
Post-Transition Metal
Polonium (Po) is a chemical element with atomic number 84, classified as a post-transition metal. At room temperature it is a solid. It was discovered in 1898 by Marie and Pierre Curie.
Properties
- Atomic number
- 84
- Atomic mass
- 209 u
- Category
- Post-Transition Metal
- Group
- 16
- Period
- 6
- Block
- p-block
- Electron configuration
- [Xe] 4f¹⁴ 5d¹⁰ 6s² 6p⁴
- Phase at STP
- Solid
- Density
- 9.32 g/cm³
- Melting point
- 527 K (253.9 °C)
- Boiling point
- 1235 K (961.9 °C)
- Electronegativity
- 2
- Atomic radius
- 135 pm
- Ionization energy
- 8.417 eV
- Discovery
- 1898 · Marie and Pierre Curie
Common uses
Nuclear batteries, anti-static devices, research
Did you know?
Discovered by Marie Curie and extremely radioactive.