Comparison of Zirconium and Technetium

Attribute	Technetium ×	Zirconium ×
Atomic mass (u)	96.90636	91.22
Standard state	Solid	Solid
Oxidation states	+4 +6 +7	+4
Electron configuration	[Kr]5s²4d⁵	[Kr]5s²4d²
Atomic radius (van der waals) (pm)	209	186
Electronegativity (pauling scale)	1.9	1.33
Electron affinity (eV)	0.55	0.426
Ionization energy (eV)	7.28	6.634
Boiling point (K)	4538	4682
Melting point (K)	2430	2128
Density (g/cm³)	11	6.52
Atomic number	43	40
Group name	Transition metal	Transition metal
Discovered (year)	1937	1789
Symbol	Tc	Zr