100Fm
Element 100
Fermium
Actinides
Fermium is a synthetic element with symbol Fm and atomic number 100.
Key data
- Atomic number
- 100
- Atomic mass
- 257.000 u
- Group / Period
- 3 / 7
- Block
- f-block
- Phase at STP
- Solid
- Density
- —
- Melting point
- 1526.8 °C
- Boiling point
- —
- Electron configuration
- [Rn] 5f12 7s2
Common uses
- •Research only
- •Very short half-life
- •Synthesized post-WWII
Discovery
Year: 1953
Discovered by: Lawrence Berkeley National Laboratory
Frequently asked questions
What is the atomic number of Fermium?
Fermium has atomic number 100. Its symbol is Fm and its atomic mass is 257 u.
What category of element is Fermium?
Fermium is classified as actinides. It sits in group 3, period 7 of the periodic table.
What is Fermium used for?
Common uses of Fermium include: Research only, Very short half-life, Synthesized post-WWII.
When was Fermium discovered?
Fermium was discovered in 1953 by Lawrence Berkeley National Laboratory.
Play the game
Test your knowledge in The Lab
20-round element ID, cryptic 3-clue guesser, and an interactive periodic table.
Open The Lab →