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.
Experiment with the elements
Polonium 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.