SymbolRe
Latin nameRhenium
Atomic number75
Period6
Element categoryTransition elements
Relative atomic mass186.207
GroupVII.B
Electronegativity
1.9
Oxidation numbers
2, 3, 4, 6, 7
Electron configuration
1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 4f14 5d5 6s2
Density [g/cm3]
21.03
State
Solid
Melting point [°C]
3180
Boiling point [°C]
5630
Atomic radius [pm]
188
Covalent radius [pm]
159
Thermal conductivity [W m-1K-1]
47.9
Heat capacity [J K-1g-1]
0.137
Discovery
1925
Hardness [Mohs scale]
7.0
Vickers hardness [MPa]
2450
Brinell hardness [MPa]
1320
Young's modulus [GPa]
463
Electrical conductivity [S m-1]
5.6 · 106
Shear modulus [GPa]
178
1.st ionization energy [eV]
7.88
Stable isotopes
2
Unstable isotopes
20