Recognised as Chemical element
Rhenium
- Re
- Z = 75
- transition metal
Rhenium (Re) is element 75, a transition metal in period 6 and group 7. Its standard atomic weight is 186.21 Da. Weights follow IUPAC standard atomic weights, 2021 revision.
Identity
SymbolRe
Standard atomic weight186.21atomic mass units (Da)
Mass in kilograms3.0920898 × 10^-25
Categorytransition metal
Group7
Period6
Blockd-block
Electrons in a neutral atom75
Neutrons in the most common isotope111≈
Electron configuration
Configuration1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹⁴ 5s² 5p⁶ 5d⁵ 6s²ground state, subshells written in order of n
Noble gas shorthand[Xe] 4f¹⁴ 5d⁵ 6s²
Electrons per shell2, 8, 18, 32, 13, 2K, L, M and outward
Electrons in the outer shell2
Unpaired electrons5Hund's rule; unpaired electrons make the free atom paramagnetic
Madelung ruleFollowedthe ground state is what the n + l filling order predicts
Quantities
Molar mass186.21 g/mol
Mass of one mole186.21 grams
Atoms in one gram3.2340587 × 10^21
Mass of one atom3.0920898 × 10^-22 g
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Neighbouring elements
Group 7
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