Comparison of Molybdenum and Rhenium

Attribute	Rhenium ×	Molybdenum ×
Atomic mass (u)	186.207	95.95
Standard state	Solid	Solid
Oxidation states	+4 +6 +7	+6
Electron configuration	[Xe]6s²4f¹⁴5d⁵	[Kr]5s¹4d⁵
Atomic radius (van der waals) (pm)	217	209
Electronegativity (pauling scale)	1.9	2.16
Electron affinity (eV)	0.15	0.746
Ionization energy (eV)	7.88	7.092
Boiling point (K)	5869	4912
Melting point (K)	3459	2896
Density (g/cm³)	20.8	10.2
Atomic number	75	42
Group name	Transition metal	Transition metal
Discovered (year)	1925	1778
Symbol	Re	Mo