Comparison of Silicon and Gadolinium

Attribute	Gadolinium ×	Silicon ×
Atomic mass (u)	157.2	28.085
Standard state	Solid	Solid
Oxidation states	+3	-4 +2 +4
Electron configuration	[Xe]6s²4f⁷5d¹	[Ne]3s²3p²
Atomic radius (van der waals) (pm)	237	210
Electronegativity (pauling scale)	1.2	1.9
Electron affinity (eV)	-	1.385
Ionization energy (eV)	6.15	8.152
Boiling point (K)	3546	3538
Melting point (K)	1586	1687
Density (g/cm³)	7.9	2.3296
Atomic number	64	14
Group name	Lanthanide	Metalloid
Symbol	Gd	Si
Discovered (year)	1880	1854