Comparison of Yttrium and Gadolinium

Attribute	Yttrium ×	Gadolinium ×
Atomic mass (u)	88.90584	157.2
Standard state	Solid	Solid
Oxidation states	+3	+3
Electron configuration	[Kr]5s²4d¹	[Xe]6s²4f⁷5d¹
Atomic radius (van der waals) (pm)	219	237
Electronegativity (pauling scale)	1.22	1.2
Electron affinity (eV)	0.307	-
Ionization energy (eV)	6.217	6.15
Boiling point (K)	3618	3546
Melting point (K)	1795	1586
Density (g/cm³)	4.47	7.9
Atomic number	39	64
Group name	Transition metal	Lanthanide
Symbol	Y	Gd
Discovered (year)	1794	1880