Comparison of Silicon and Curium

Attribute	Silicon ×	Curium ×
Atomic mass (u)	28.085	247.07035
Standard state	Solid	Solid
Oxidation states	-4 +2 +4	+3
Electron configuration	[Ne]3s²3p²	[Rn]7s²5f⁷6d¹
Atomic radius (van der waals) (pm)	210	245
Electronegativity (pauling scale)	1.9	1.3
Electron affinity (eV)	1.385	-
Ionization energy (eV)	8.152	6.02
Boiling point (K)	3538	3400
Melting point (K)	1687	1618
Density (g/cm³)	2.3296	13.51
Atomic number	14	96
Group name	Metalloid	Actinide
Symbol	Si	Cm
Discovered (year)	1854	1944