Comparison of Technetium and Ruthenium

Attribute	Ruthenium ×	Technetium ×
Atomic mass (u)	101.1	96.90636
Standard state	Solid	Solid
Oxidation states	+3	+4 +6 +7
Electron configuration	[Kr]5s¹4d⁷	[Kr]5s²4d⁵
Atomic radius (van der waals) (pm)	207	209
Electronegativity (pauling scale)	2.2	1.9
Electron affinity (eV)	1.05	0.55
Ionization energy (eV)	7.361	7.28
Boiling point (K)	4423	4538
Melting point (K)	2607	2430
Density (g/cm³)	12.1	11
Atomic number	44	43
Group name	Transition metal	Transition metal
Discovered (year)	1827	1937
Symbol	Ru	Tc