Fermium

Atomic symbol: Fm
Atomic number: 100
Atomic mass: 257

Appearance: Solid at 25°C

Group: N/a Period: 7
Series: Actinides
Block: f
Electron configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 5s² 5p⁶ 4f¹⁴ 5d¹⁰ 6s² 6p⁶ 5f¹² 7s²

Synthetically produced and highly radioactive.

Fermium has no known uses besides scientific interest.

Fun Fact! The first hydrogen bomb test, in 1952, led to the surprise discovery of both fermium and einsteinium in the debris.