Comparison of Silicon and Yttrium

Attribute	Yttrium ×	Silicon ×
Atomic mass (u)	88.90584	28.085
Standard state	Solid	Solid
Oxidation states	+3	-4 +2 +4
Electron configuration	[Kr]5s²4d¹	[Ne]3s²3p²
Atomic radius (van der waals) (pm)	219	210
Electronegativity (pauling scale)	1.22	1.9
Electron affinity (eV)	0.307	1.385
Ionization energy (eV)	6.217	8.152
Boiling point (K)	3618	3538
Melting point (K)	1795	1687
Density (g/cm³)	4.47	2.3296
Atomic number	39	14
Group name	Transition metal	Metalloid
Discovered (year)	1794	1854
Symbol	Y	Si