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75
Re
186.21
Rhenium
Transition metals · Group 7 · Period 6
Atomic properties
| Atomic number | 75 |
|---|---|
| Symbol | Re |
| Standard atomic weight | 186.21 |
| Classification | Transition metals |
| Group | 7 |
| Period | 6 |
| Block | d-block |
| Electron configuration | [Xe] 4f14 5d5 6s2 |
| Electronegativity (Pauling) | 1.90 |
| Common oxidation states | +7, +4 |
Physical properties
| Phase at 20 °C | Solid |
|---|---|
| Density | 21.02 g/cm³ |
| Melting point | 3186 °C |
| Boiling point | 5596 °C |
| Discovered | 1925 |
| CAS number | — |