Europium (Eu)

From Wikipedia, the free encyclopediaEuropium is a chemical element with symbol Eu and atomic number 63. It was isolated in 1901 and is named after the continent of Europe. It is a moderately hard, silvery metal which readily oxidizes in air and water.

Europium in the periodic table

SymbolEu
Atomic number63
Group0
Period6
Blockf
Element categoryLanthanide

Physical properties

Phase at STPSolid
Density5.264 g/cm3
Atomic weight151.964 u
Melting point1099 K
825.85 °C
1518.53 °F
Boiling point1802 K
1528.85 °C
2783.93 °F

Atomära egenskaper

Electronegativity (Pauling Scale)1.2
Electron affinity11.2 kJ/mol
Ionization energies
1547.1 kJ/mol
2 1085 kJ/mol
3 2404 kJ/mol
4 4120 kJ/mol

Electron configuration

Electron configuration1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f7 5s2 5p6 6s2
Electrons per shell2, 8, 18, 25, 8, 2

History

Discovered1896
Discovered byEugène-Anatole Demarçay