Comparison of Germanium and Gadolinium

Attribute	Gadolinium ×	Germanium ×
Atomic mass (u)	157.2	72.63
Standard state	Solid	Solid
Oxidation states	+3	+2 +4
Electron configuration	[Xe]6s²4f⁷5d¹	[Ar]4s²3d¹⁰4p²
Atomic radius (van der waals) (pm)	237	211
Electronegativity (pauling scale)	1.2	2.01
Electron affinity (eV)	-	1.35
Ionization energy (eV)	6.15	7.9
Boiling point (K)	3546	3106
Melting point (K)	1586	1211.4
Density (g/cm³)	7.9	5.323
Atomic number	64	32
Group name	Lanthanide	Metalloid
Symbol	Gd	Ge
Discovered (year)	1880	1886