Comparison of Gadolinium and Curium

Attribute	Curium ×	Gadolinium ×
Standard state	Solid	Solid
Electron configuration	[Rn]7s²5f⁷6d¹	[Xe]6s²4f⁷5d¹
Atomic mass (u)	247.07035	157.2
Electronegativity (pauling scale)	1.3	1.2
Oxidation states	+3	+3
Ionization energy (eV)	6.02	6.15
Atomic radius (van der waals) (pm)	245	237
Boiling point (K)	3400	3546
Melting point (K)	1618	1586
Density (g/cm³)	13.51	7.9
Atomic number	96	64
Group name	Actinide	Lanthanide
Discovered (year)	1944	1880
Symbol	Cm	Gd