63
Eu
Europium
153
Europium (Eu)
LanthanidePeriod 6f-block-block
Europium 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.
Latin name: Europium
Atomic Number
63
Atomic Mass
153 g/mol
Phase (STP)
Solid
Electron Config.
[Xe] 4f⁷ 6s²
General
SymbolEu
Atomic Number63
Atomic Mass153 g/mol
CategoryLanthanide
Period6
Blockf-block
Electron Configuration[Xe] 4f⁷ 6s²
Valence Electrons9
Coloursilvery-white metallic
CAS NumberCAS7440-53-1
Physical Properties
Phase (STP)Solid
Density5.26 g/cm³
Melting Point825.85°C · 1518.53°F · 1099.00 K
Boiling Point1528.85°C · 2783.93°F · 1802.00 K
Atomic Properties
Atomic Radius233 pm
Electronegativity1.2 Pauling
Ionization Energy547 kJ/mol
Oxidation States+3, +2
Ion ChargeEu2+/Eu3+
Thermodynamic
Molar Heat27.66 J/(mol·K)
Crystal Structure
Crystal Structurebody-centered cubic
Mechanical Properties
Mohs Hardness2
Nuclear & Hazards
Half-lifestable (Eu-153)
Abundance
In Universe0.00004%
In Sun0.00003%
In Earth's Crust0.0120%
In Meteorites0.00009999999999999999%
Discovery & History
Discovery Year1901
Discovered ByEugène-Anatole Demarçay
Country of DiscoveryFrance
Isotopes of Europium
| Isotope | Abundance | Half-life | Decay |
|---|---|---|---|
| Eu-151 | 47.81% | Stable | — |
| Eu-153 | 52.19% | Stable | — |