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Rhenium (Re)

From Wikipedia, the free encyclopediaRhenium is a chemical element with symbol Re and atomic number 75. It is a silvery-white, heavy, third-row transition metal in group 7 of the periodic table. With an estimated average concentration of 1 part per billion (ppb), rhenium is one of the rarest elements in the Earth's crust.

Rhenium in the periodic table

SymbolRe
Atomic number75
Group7
Period6
Blockd
Element categoryTransition Metal

Physical properties

Phase at STPSolid
Density21.02 g/cm3
Atomic weight186.207 u
Melting point3459 K
3185.85 °C
5766.53 °F
Boiling point5869 K
5595.85 °C
10104.53 °F

Atomic properties

Electronegativity (Pauling Scale)1.9
Electron affinity5.8273 kJ/mol
Oxidation states−3, −1, 0, +1, +2, +3, +4, +5, +6, +7
(a mildly acidic oxide)
Ionization energies
1760 kJ/mol
2 1260 kJ/mol
3 2510 kJ/mol
4 3640 kJ/mol

Electron configuration

Elektronkonfiguration (shorthand)[Xe] 4f14 5d5 6s2
Electron configuration1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d5 6s2
Electrons per shell2, 8, 18, 32, 13, 2

History

Discovered1908
Discovered byMasataka Ogawa
Named byWalter Noddack
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