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Atomic Number	64

Atomic Symbol	Gd

Atomic Weight	157.25 amu

Group	Rare Earth (Lanthanide Series)

Form	Solid

Density @ STP	7.90 g/cm³

Melting Point	1313 °C (2395.4 °F, 1586.15 °K)

Boiling Point	3273 °C (5923.4 °F, 3546.15 °K)

Heat of Fusion	10.0 kJ/mol

Heat of Vaporization	305 kJ/mol

First Ionization Potential	6.15 eV

Electronegativity (on Pauling scale	1.20

Specific Heat Capacity	0.236 J/g K

Ground State Electron Configuration	4f⁷ 5s² 5p⁶ 5d¹ 6s²

Oxidation State(s)	+3

Stable Isotopes and Natural Abundance on Earth	¹⁵²Gd, 0.20%; ¹⁵⁴Gd, 2.18%; ¹⁵⁵Gd, 14.80%; ¹⁵⁶Gd, 20.47%; ¹⁵⁷Gd, 15.65%; ¹⁵⁸Gd, 24.84%; ¹⁶⁰Gd, 21.86%

Selected Radioisotopes	¹⁴⁸Gd, ¹⁵³Gd

Atomic Radius	223 pm

Crystal Structure	Hexagonal

Discovered by	Galissard de Marignac, 1880