95 Am 243
Americium
actinide
Properties
- Atomic number
- 95
- Atomic mass
- 243 u
- Category
- actinide
- Group
- f-block
- Period
- 7
- Block
- f-block
- State (room temp)
- Solid
- Outer-shell electrons
- 2
- Electronegativity
- 1.13 (Pauling)
- Density
- 12 g/cm³
- Melting point
- 1175.85 °C
- Boiling point
- 2606.85 °C
Electron configuration
1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p⁶ 7s² 5f⁷
Noble-gas shorthand: [Rn] 5f⁷ 7s²
Electrons per shell: 2, 8, 18, 32, 25, 8, 2 — that's 2 in the outermost shell.
About Americium
Americium is a radioactive transuranic chemical element with symbol Am and atomic number 95. This member of the actinide series is located in the periodic table under the lanthanide element europium, and thus by analogy was named after the Americas. Americium was first produced in 1944 by the group of Glenn T.Seaborg from Berkeley, California, at the metallurgical laboratory of University of Chicago.
- Discovered by Glenn T. Seaborg
- Appearance: silvery white
Position in the periodic table
Data compiled from Wikipedia, PubChem, and IUPAC. Source.