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Europium

Chemical element
Europium is a chemical element; it has symbol Eu and atomic number 63. Europium is a silvery-white metal of the lanthanide series that reacts readily with air to form a dark oxide coating. It is the most chemically reactive, least dense, and... Wikipedia
Symbol: Eu
Atomic number: 63
Electron configuration: Xe 4f7 6s2
Atomic mass: 151.964 u
Discovered: 1901
Melting point: 1,519°F (826°C)