Gadolinium

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

Property	Value
Atomic Number	64
Element	Gadolinium
Symbol	Gd
Atomic Mass	157.25 u
Number of Neutrons	94 (most common isotope, Gadolinium-158)
Number of Protons	64
Number of Electrons	64
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	237 pm
Electronegativity	1.20 (Pauling scale)
First Ionization Energy	6.150 eV
Density	7.90 g/cm³
Melting Point	1313 °C
Boiling Point	3273 °C
Number of Isotopes	7 naturally occurring (Gd-152, Gd-154, Gd-155, Gd-156, Gd-157, Gd-158, Gd-160)
Discoverer	Jean Charles Galissard de Marignac
Year	1880
Specific Heat	0.236 J/g·K
Number of Shells	6
Number of Valence Electrons	3