75186.21ReRhenium
Rhenium (Re) — element 75transition metal · group 7, period 6
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 (the d-block), with a standard atomic mass of 186.21 u. At room temperature (25 °C) rhenium is a solid.
💡 Known for: One of the rarest elements in Earth's crust; used in jet-engine superalloys.
# Rhenium properties
| Symbol | Re |
|---|---|
| Atomic number | 75 |
| Atomic mass | 186.21 u |
| Category | transition metal |
| Group | 7 |
| Period | 6 |
| Block | d-block |
| Electron configuration | [Xe] 4f¹⁴ 5d⁵ 6s² |
| Full configuration | 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹⁴ 5s² 5p⁶ 5d⁵ 6s² |
| Electrons per shell | 2, 8, 18, 32, 13, 2 |
| Protons / electrons | 75 / 75 |
| State at 25 °C | solid |
| Melting point | 3459 K (3185.8 °C, 5766.5 °F) |
| Boiling point | 5869 K (5595.9 °C, 10104.5 °F) |
| Density | 21.02 g/cm³ |
| Electronegativity (Pauling) | 1.9 |
| First ionization energy | 7.833 eV |
| Atomic radius | 188 pm |
| Discovered | 1925 |
# Electron configuration of rhenium
The electron configuration of rhenium is [Xe] 4f¹⁴ 5d⁵ 6s², written out in full as 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹⁴ 5s² 5p⁶ 5d⁵ 6s². Its 75 electrons fill 6 shells as 2, 8, 18, 32, 13, 2, so the outermost shell holds 2 electrons.
# Related elements
WTungstenprevious elementOsOsmiumnext elementMnManganesegroup 7TcTechnetiumgroup 7BhBohriumgroup 7ScScandiumtransition metalTiTitaniumtransition metalVVanadiumtransition metalCrChromiumtransition metalFeIrontransition metalCoCobalttransition metalNiNickeltransition metalCuCoppertransition metal
# Rhenium FAQ
What is the atomic number of rhenium?
The atomic number of rhenium is 75: every rhenium atom has 75 protons in its nucleus. Its symbol is Re.
What is the atomic mass of rhenium?
The standard atomic mass of rhenium is 186.21 u.
What is the electron configuration of rhenium?
Rhenium's electron configuration is [Xe] 4f¹⁴ 5d⁵ 6s² (1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹⁴ 5s² 5p⁶ 5d⁵ 6s²), with 2, 8, 18, 32, 13, 2 electrons per shell.
Is rhenium a metal?
Yes. Rhenium is a transition metal, one of the metals.
What is the melting point of rhenium?
Rhenium melts at 3459 K (3185.8 °C, 5766.5 °F) and boils at 5869 K (5595.9 °C, 10104.5 °F).
What is rhenium used for / known for?
One of the rarest elements in Earth's crust; used in jet-engine superalloys.