Rhenium (Re) – element 75
Rhenium is a chemical element with the symbol Re and atomic number 75. It is a transition metal in group 7, period 6 of the periodic table (d-block), and is a solid at room temperature.
Rhenium (Re) has atomic number 75, atomic mass 186.21 u and electron configuration [Xe] 4f14 5d5 6s2.
Rhenium facts
| Symbol | Re |
|---|---|
| Atomic number | 75 |
| Atomic mass | 186.21 u (g/mol) |
| Category | transition metal |
| Group | group 7 |
| Period | 6 |
| Block | d-block |
| Phase at 20 °C | Solid |
| Electron configuration | 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d5 |
| Noble-gas notation | [Xe] 4f14 5d5 6s2 |
| Electrons per shell | 2, 8, 18, 32, 13, 2 |
Bohr model and shells
Rhenium has 75 electrons in 6 shells: 2, 8, 18, 32, 13, 2. Full configuration and noble-gas notation are in the table; work out any element or ion with the electron configuration calculator.
Physical and atomic properties
| Melting point | 3459 K (3185.8 °C) |
|---|---|
| Boiling point | 5869 K (5595.9 °C) |
| Density | 21.02 g/cm³ |
| Electronegativity (Pauling) | 1.9 |
| Electron affinity | 5.8273 kJ/mol |
| Ionization energies | 760, 1260, 2510 kJ/mol (1st, 2nd, 3rd) |
| Molar heat capacity | 25.48 J/(mol·K) |
| Discovered by | Masataka Ogawa |
Use the atomic mass in the molar mass calculator for any formula containing Re.
Position in the periodic table
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Frequently asked questions
What is the atomic mass of rhenium?
The atomic mass of rhenium is 186.21 u, so one mole of rhenium atoms weighs 186.21 g.
What is the electron configuration of rhenium?
Rhenium has 75 electrons: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d⁵, or [Xe] 4f¹⁴ 5d⁵ 6s² in noble-gas notation. Electrons per shell: 2, 8, 18, 32, 13, 2.
Is rhenium a metal?
Yes. Rhenium is a transition metal.
Where is rhenium on the periodic table?
Rhenium is in group 7, period 6, in the d-block.
Data: Periodic-Table-JSON (CC BY-SA 3.0); standard atomic weights from IUPAC (abridged). Values in brackets are the mass number of the longest-lived isotope.