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This is europium.

Symbol Eu
Atomic number 63
Atomic mass 151.96 amu

Europium, discovered in 1896, is an element in the lanthanide series.

Distinguishing properties

It is the most reactive of the rare earths. Shown in the image is a sample of europium photographed in argon.


Europium had virtually no practical use until the atomic age. Europium can absorb more neutrons than any other elements, making it very valuable in control rods for nuclear reactors.

See also

Periodic table of the elements