95 Am 243
Americium
Actinide
Americium (Am) is a chemical element with atomic number 95, classified as a actinide. At room temperature it is a solid. It was discovered in 1944 by Glenn T. Seaborg et al..
Properties
- Atomic number
- 95
- Atomic mass
- 243 u
- Category
- Actinide
- Group
- 0
- Period
- 7
- Block
- f-block
- Electron configuration
- [Rn] 5f⁷ 7s²
- Phase at STP
- Solid
- Density
- 13.69 g/cm³
- Melting point
- 1449 K (1175.8 °C)
- Boiling point
- 2880 K (2606.8 °C)
- Electronegativity
- 1.13
- Atomic radius
- 244 pm
- Ionization energy
- 5.974 eV
- Discovery
- 1944 · Glenn T. Seaborg et al.
Common uses
Smoke detectors, neutron sources, research
Did you know?
Found in household smoke detectors and named after America.