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Fermium Facts

Fermium Chemical & Physical Properties

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Fermium was first observed in the Ivy Mike test.

Fermium, a radioactive element, was first observed in the fallout from the Ivy Mike nuclear test.

Photo courtesy of National Nuclear Security Administration / Nevada Site Office This is the electron configuration of a fermium atom.

This is the electron configuration of a fermium atom.

This is the location of fermium on the periodic table.

This is the location of fermium on the periodic table.

Todd Helmenstine
Periodic Table of the Elements

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.)

 

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