Europium (Eu) » Innovachem

Isotope	Z(p)	N(n)	Atomic Mass	Natural Abundance	Enrichment Level	Chemical Form
Eu-151	63	88	150.919846	47.80%	97.50-99.24%	Oxide
Eu-153	63	90	152.921226	52.20%	99.70%	Oxide

Name	Europium
Symbol	Eu
Atomic number	63
Atomic weight	151.97
Standard state	Solid at 298 ºK
CAS Registry ID	7440-53-1
Group in periodic table	N/A
Group name	Lanthanoid
Period in periodic table	6 (lanthanoid)
Block in periodic table	f-block
Color	Silvery white
Classification	Metallic
Melting point	822 °C
Boiling point	1597 °C
Vaporization point	1596 ºC
Thermal conductivity	13.9 W/(m·K) at 298.2 ºK
Electrical resistivity	90.0 µΩ·cm at 25 ºC
Electronegativity	1.2
Specific heat	0.176 J/g mol at 20 ºC
Heat of vaporization	175 kJ·mol^-1
Heat of fusion	9.2 kJ·mol^-1
Density of liquid	5.13 g/cm³ at 822 °C
Density of solid	5.26 g/cm³
Electron configuration	[Xe]4f⁶5d¹6s² (partially filled orbitals)
Oxidation states	+2, +3