Rhenium (Re)
Rhenium is the chemical element with atomic number 75 and symbol Re. It is a transition metal in period 6, group 7, with a standard atomic weight of 186.21 u.
Key facts
- Z
- 75
- Atomic weight
- 186.21 u
- Category
- transition metal
- State at 298 K
- Solid
- Occurrence
- primordial
- Discovered
- 1925
- CAS
- 7440-15-5
Measured properties
| Property | Value | Source |
|---|---|---|
| Electronegativity | 1.9 | National Center for Biotechnology Information (NIH) |
| Melting point | 3,459 K | National Center for Biotechnology Information (NIH) |
| Boiling point | 5,869 K | National Center for Biotechnology Information (NIH) |
| Density stp | 20.8 g/cm³ | National Center for Biotechnology Information (NIH) |
| Atomic radius empirical | 217 pm | National Center for Biotechnology Information (NIH) |
| Ionization energy 1st | 760.3 kJ/mol | National Center for Biotechnology Information (NIH) |
| Electron affinity | 14.5 kJ/mol | National Center for Biotechnology Information (NIH) |
Electron configuration
- Noble gas notation
- [Xe] 4f¹⁴ 5d⁵ 6s²
- Full notation
- 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹⁴ 5s² 5p⁶ 5d⁵ 6s²
- Electrons per shell
- 2, 8, 18, 32, 13, 2