100Fm257
Fermium
Actinide · element 100 · f-block (shown below the main table)
Quick facts
| Symbol | Fm |
|---|---|
| Atomic number | 100 |
| Relative atomic mass | 257 |
| Category | Actinide |
| Position | f-block (shown below the main table) |
| State at 20 °C | Unknown (too few atoms have been made) |
| Melting point | — |
| Boiling point | — |
| Density | — |
| Electronegativity | — |
| Electron configuration | [Rn] 5f12 7s2 |
About Fermium
Fermium has the symbol Fm and atomic number 100, which means every fermium atom has 100 protons in its nucleus and, in a neutral atom, 100 electrons. At room temperature it is unknown (too few atoms have been made).
Actinides are the second row of the f-block. They are all radioactive, and only a few (like uranium and thorium) occur naturally in large amounts.
Explore it
See where fermium sits, and drag the temperature slider to watch it melt and boil, on the interactive periodic table. Practise with quizzes on OmniEx.