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.
Experiment with the elements
Americium 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.