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Rhenium (Re)
Atomic number 75 · transition
| Atomic number | 75 |
|---|---|
| Atomic mass | 186.207 u |
| Molar mass | 186.207 g/mol |
| Category | transition |
| Group / period / block | 7 / 6 / d |
| Electron configuration | [Xe] 4f14 5d5 6s2 |
| Electrons per shell | 2, 8, 18, 32, 13, 2 |
| Electronegativity (Pauling) | 1.9 |
| Atomic radius | 135.0 pm |
| Density | 20.8 g/cm³ |
| First ionisation energy | 7.8335 eV |
| Melting point | 3458.15 K (3185.00 °C) |
| Boiling point | 5863.15 K (5590.00 °C) |
| Common oxidation states | +4 |
| Abundance in Earth's crust | 0.0007 ppm |
Uses
Jet-engine superalloys
Discovery
1925, Walter Noddack, Ida Tacke, Otto Berg