Europium

Chaitra 26/06/2026 19:58:08 Updated 26/06/2026 19:58:08

Property	Value
Atomic Number	63
Element	Europium
Symbol	Eu
Atomic Mass	151.964 u
Number of Neutrons	89 (most common isotope, Europium-153)
Number of Protons	63
Number of Electrons	63
Period	6
Group	Lanthanide (no fixed group number)
Phase	Solid
Radioactive	No (some isotopes are radioactive)
Natural	Yes
Metal	Yes
Nonmetal	No
Metalloid	No
Type	Lanthanide
Atomic Radius	233 pm
Electronegativity	1.20 (Pauling scale)
First Ionization Energy	5.670 eV
Density	5.24 g/cm³
Melting Point	826 °C
Boiling Point	1529 °C
Number of Isotopes	2 stable (Eu-151, Eu-153)
Discoverer	Eugène-Anatole Demarçay
Year	1901
Specific Heat	0.182 J/g·K
Number of Shells	6
Number of Valence Electrons	3