Element 75
Rhenium (Re)
Rhenium (Re) is element 75 of the periodic table, a transition metal in period 6, group 7 (d-block) with an atomic mass of 186.21 and is a solid at standard conditions.
At a glance
- Atomic number
- 75
- Symbol
- Re
- Atomic mass
- 186.21 u
- Category
- Transition metals
- Period
- 6
- Group
- 7
- Block
- d-block
- Phase at STP
- solid
Electron structure
- Electron configuration
- 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d5 6s2
- Shorthand configuration
- [Xe] 4f14 5d5 6s2
- Electrons per shell
- 2, 8, 18, 32, 13, 2
- Oxidation states
- -3, -1, +1, +2, +3, +4, +5, +6, +7
Physical properties
- Melting point
- 3,459 K (3,185.85 °C)
- Boiling point
- 5,869 K (5,595.85 °C)
- Density
- 21.02 g/cm³
- Phase
- solid
Atomic properties
- Electronegativity (Pauling)
- 1.9
- Atomic radius
- 188 pm
- Covalent radius
- 151 pm
- First ionization energy
- 760 kJ/mol
- Electron affinity
- 6 kJ/mol
Notable isotopes
| Isotope | Mass | Abundance | Stability |
|---|---|---|---|
| Re-187 | 186.95575 | 62.6% | Stable |
Common uses
- Jet engine turbines
- Catalysts
- Thermocouples
- Mass spectrometry
Discovery
- Year
- 1925
- Discovered by
- Masataka Ogawa, Walter Noddack, Ida Tacke
- Country
- Germany
Frequently asked questions
- Is rhenium a metal?
- Yes. Rhenium is a metal, classified as a transition metal on the periodic table.
- How many protons does rhenium have?
- Rhenium has 75 protons. Its atomic number is 75, which is also the number of electrons in a neutral atom of rhenium.
- What group and period is rhenium in?
- Rhenium is in group 7 and period 6 of the periodic table, in the d-block.
- What is the atomic mass of rhenium?
- The atomic mass of rhenium is 186.21 u (unified atomic mass units).
Keep exploring
Rhenium's row is on the printable element property sheet, and its tile is on the periodic table wall chart - the same numbers as above, laid out for A4 or A3 paper.