100Fm257.09511
Fermium
Actinide
Solid at STP
Period 7Block FDiscovered 1952
[Rn] 5f12 7s2
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.
📖 Read more on Wikipedia →Atomic Properties
| Atomic Number | 100 |
| Atomic Mass | 257.09511 u |
| Electron Configuration | [Rn] 5f12 7s2 |
| Oxidation States | +3 |
| Electronegativity | 1.3 (Pauling) |
| Ionization Energy | 6.5 eV |
| Block | F |
Physical Properties
| Standard State | Solid |
| Melting Point | 1800 K (1526.8 °C) |
| CPK Color | #B31FBA |
Classification
| Category | Actinide |
| Group Block | Actinide |
| Period | 7 |
| Block | F |
Discovery
| Year Discovered | 1952 |
| Discovered By | Lawrence Berkeley National Laboratory |
| Electron Shells | 2, 8, 18, 32, 30, 8, 2 |