Tungstène (W): Bohr Model, Protons, Neutrons & Electrons
Tungstène is element number 74, a transition metal in group 6, period 6. Its atom has 74 protons, 110 neutrons and 74 electrons arranged in 6 shells: 2, 8, 18, 32, 12, 2.
- 74 protons
- 110 neutrons
- 74 electrons
Protons, neutrons and electrons in tungsten
Le atomic number of tungsten is 74, so every tungsten atom has 74 protons. A neutral atom has the same number of electrons, 74. The number of neutrons depends on the isotope: neutrons = mass number − atomic number. For tungsten-184, that is 184 − 74 = 110 neutrons. Tungsten has 5 stable isotopes, with 106, 108, 109, 110, 112 neutrons.
How to draw the Bohr model of tungsten
- Draw the nucleus and write 74 p⁺ et 110 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 12 electrons on it.
- Draw the sixth shell and put 2 electrons on it.
- Check: 2 + 8 + 18 + 32 + 12 + 2 = 74 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, 12, 2) is the one to draw.
Electron configuration
The electron configuration of tungsten is [Xe] 6s² 4f¹⁴ 5d⁴. As a transition metal it fills an inner d-subshell, and its common ion is W⁶⁺.
Key facts about tungsten
| Symbol | W |
|---|---|
| Atomic number | 74 |
| Relative atomic mass | 183.84 |
| Group · period · block | group 6 · period 6 · d-block |
| Type | Métal de transition |
| State at 25 °C | solid |
| Couches électroniques | 2, 8, 18, 32, 12, 2 |
| Electron configuration | [Xe] 6s² 4f¹⁴ 5d⁴ |
| Électrons de valence | varies (outer shell: 2) |
| Common ion | W⁶⁺ |
| Electronegativity (Pauling) | 2.36 |
| First ionisation energy | 7.86 eV (758 kJ/mol) |
| Atomic radius (empirical) | 135 pm |
Où tungsten sits on the periodic table
Foire aux questions
How many protons, neutrons and electrons does tungsten have?
Tungsten has 74 protons and 74 electrons (atomic number 74). Its most common isotope, tungsten-184, has 184 − 74 = 110 neutrons.
What is the electron configuration of tungsten?
[Xe] 6s² 4f¹⁴ 5d⁴. In shells that is 2, 8, 18, 32, 12, 2.
How many valence electrons does tungsten have?
Tungsten is a transition metal, so its valence electrons are spread over two shells; its outermost shell holds 2.
Where is tungsten on the periodic table?
In group 6, period 6, in the d-block. It is a transition metal.
