Comparison of Technetium and Thorium

Attribute	Technetium ×	Thorium ×
Atomic mass (u)	96.90636	232.038
Standard state	Solid	Solid
Oxidation states	+4 +6 +7	+4
Electron configuration	[Kr]5s²4d⁵	[Rn]7s²6d²
Atomic radius (van der waals) (pm)	209	237
Electronegativity (pauling scale)	1.9	1.3
Electron affinity (eV)	0.55	-
Ionization energy (eV)	7.28	6.08
Boiling point (K)	4538	5061
Melting point (K)	2430	2023
Density (g/cm³)	11	11.72
Atomic number	43	90
Group name	Transition metal	Actinide
Symbol	Tc	Th
Discovered (year)	1937	1828