100 Fm 257
Fermium
actinide
Properties
- Atomic number
- 100
- Atomic mass
- 257 u
- Category
- actinide
- Group
- f-block
- Period
- 7
- Block
- f-block
- State (room temp)
- Solid
- Outer-shell electrons
- 2
- Electronegativity
- 1.3 (Pauling)
- Density
- —
- Melting point
- 1526.85 °C
- Boiling point
- —
Electron configuration
1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p⁶ 7s² 5f¹²
Noble-gas shorthand: [Rn] 5f¹² 7s²
Electrons per shell: 2, 8, 18, 32, 30, 8, 2 — that's 2 in the outermost shell.
About Fermium
Fermium is a synthetic element with symbol Fm and atomic number 100. It is a member of the actinide series. It is the heaviest element that can be formed by neutron bombardment of lighter elements, and hence the last element that can be prepared in macroscopic quantities, although pure fermium metal has not yet been prepared.
- Discovered by Lawrence Berkeley National Laboratory
Position in the periodic table
Data compiled from Wikipedia, PubChem, and IUPAC. Source.