Fermium Facts

Fermium

Symbol: Fm

Atomic Number: 100

Atomic Weight: 257.0951

Element Classification: Radioactive Rare Earth (Actinide)

Discovery: Argonne, Los Alamos, U. of California 1953 (United States)

Name Origin: Named in honor of the scientist Enrico Fermi.

Melting Point (K): 1800

Appearance: radioactive, synthetic metal

Atomic Radius (pm): 290

Pauling Negativity Number: 1.3

First Ionizing Energy (kJ/mol): (630)

Oxidation States: 3

Electronic Configuration: [Rn] 5f¹² 7s²

References: Los Alamos National Laboratory (2001), Crescent Chemical Company (2001), Lange's Handbook of Chemistry (1952), CRC Handbook of Chemistry & Physics (18th Ed.)

Return to the Periodic Table

Recent Chemistry Features | Chemistry Encyclopedia