Element 63
Europium (Eu)
Europium (Eu) is element 63 of the periodic table, a lanthanide in period 6 (f-block) with an atomic mass of 151.96 and is a solid at standard conditions.
At a glance
- Atomic number
- 63
- Symbol
- Eu
- Atomic mass
- 151.96 u
- Category
- Lanthanides
- Period
- 6
- Block
- f-block
- Phase at STP
- solid
Electron structure
- Electron configuration
- 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f7 5s2 5p6 6s2
- Shorthand configuration
- [Xe] 4f7 6s2
- Electrons per shell
- 2, 8, 18, 25, 8, 2
- Oxidation states
- +2, +3
Physical properties
- Melting point
- 1099 K
- Boiling point
- 1802 K
- Density
- 5.243 g/cm3
- Phase
- solid
Atomic properties
- Electronegativity (Pauling)
- 1.2
- Atomic radius
- 231 pm
- Covalent radius
- 198 pm
- First ionization energy
- 547 kJ/mol
- Electron affinity
- 50 kJ/mol
Notable isotopes
| Isotope | Mass | Abundance | Stability |
|---|---|---|---|
| Eu-153 | 152.92124 | 52.19% | Stable |
Common uses
- TV screens
- Euro banknote security
- Fluorescent lamps
- Lasers
Discovery
- Year
- 1901
- Discovered by
- Eugène-Anatole Demarçay
- Country
- France