Rhénium (Re): Bohr Model, Protons, Neutrons & Electrons
Rhénium is element number 75, a transition metal in group 7, period 6. Its atom has 75 protons, 112 neutrons and 75 electrons arranged in 6 shells: 2, 8, 18, 32, 13, 2.
- 75 protons
- 112 neutrons
- 75 electrons
Protons, neutrons and electrons in rhenium
Le atomic number of rhenium is 75, so every rhenium atom has 75 protons. A neutral atom has the same number of electrons, 75. The number of neutrons depends on the isotope: neutrons = mass number − atomic number. For rhenium-187, that is 187 − 75 = 112 neutrons. Rhenium has 2 stable isotopes, with 110, 112 neutrons.
How to draw the Bohr model of rhenium
- Draw the nucleus and write 75 p⁺ et 112 n⁰ inside it.
- Draw the first shell and put 2 electrons on it (the first shell holds at most 2).
- Draw the second shell and put 8 electrons on it.
- Draw the third shell and put 18 electrons on it.
- Draw the fourth shell and put 32 electrons on it.
- Draw the fifth shell and put 13 electrons on it.
- Draw the sixth shell and put 2 electrons on it.
- Check: 2 + 8 + 18 + 32 + 13 + 2 = 75 electrons, the same as the number of protons.
From potassium onwards the shells don’t simply fill as 2, 8, 8: the fourth shell starts before the third is full, so the real arrangement above (2, 8, 18, 32, 13, 2) is the one to draw.
Electron configuration
The electron configuration of rhenium is [Xe] 6s² 4f¹⁴ 5d⁵. As a transition metal it fills an inner d-subshell, and its common ion is Re⁴⁺.
Key facts about rhenium
| Symbol | Re |
|---|---|
| Atomic number | 75 |
| Relative atomic mass | 186.21 |
| Group · period · block | group 7 · period 6 · d-block |
| Type | Métal de transition |
| State at 25 °C | solid |
| Couches électroniques | 2, 8, 18, 32, 13, 2 |
| Electron configuration | [Xe] 6s² 4f¹⁴ 5d⁵ |
| Électrons de valence | varies (outer shell: 2) |
| Common ion | Re⁴⁺ |
| Electronegativity (Pauling) | 1.90 |
| First ionisation energy | 7.83 eV (755 kJ/mol) |
| Atomic radius (empirical) | 135 pm |
Où rhenium sits on the periodic table
Foire aux questions
How many protons, neutrons and electrons does rhenium have?
Rhenium has 75 protons and 75 electrons (atomic number 75). Its most common isotope, rhenium-187, has 187 − 75 = 112 neutrons.
What is the electron configuration of rhenium?
[Xe] 6s² 4f¹⁴ 5d⁵. In shells that is 2, 8, 18, 32, 13, 2.
How many valence electrons does rhenium have?
Rhenium is a transition metal, so its valence electrons are spread over two shells; its outermost shell holds 2.
Where is rhenium on the periodic table?
In group 7, period 6, in the d-block. It is a transition metal.
