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Europium Facts

Chemical & Physical Properties


This is a photo of europium in a glovebox under argon.

This is a photo of europium in a glovebox under argon. The dendrites in the 300g crystalline sample are readily apparent. Europium is a metal that oxidizes instantly in air.

Alchemist-hp, Creative Commons License
Periodic Table of the Elements


Atomic Number: 63

Symbol: Eu

Atomic Weight: 151.9655

Discovery: Boisbaudran 1890; Eugene-Antole Demarcay 1901 (France)

Electron Configuration: [Xe] 4f7 6s2

Element Classification: Rare Earth (Lanthanide)

Word Origin: Named for the continent of Europe.

Density (g/cc): 5.243

Melting Point (K): 1095

Boiling Point (K): 1870

Appearance: soft, silvery-white metal

Atomic Radius (pm): 199

Atomic Volume (cc/mol): 28.9

Covalent Radius (pm): 185

Ionic Radius: 95 (+3e) 109 (+2e)

Specific Heat (@20°C J/g mol): 0.176

Evaporation Heat (kJ/mol): 176

Pauling Negativity Number: 0.0

First Ionizing Energy (kJ/mol): 546.9

Oxidation States: 3, 2

Lattice Structure: Body-Centered Cubic

Lattice Constant (Å): 4.610

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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