Flúor (F): Bohr Model, Protons, Neutrons & Electrons
Flúor is element number 9, a halogen in group 17, period 2. Its atom has 9 protons, 10 neutrons and 9 electrons arranged in 2 shells: 2, 7.
- 9 protons
- 10 neutrons
- 9 electrons
Protons, neutrons and electrons in fluorine
El atomic number of fluorine is 9, so every fluorine atom has 9 protons. A neutral atom has the same number of electrons, 9. The number of neutrons depends on the isotope: neutrons = mass number − atomic number. For fluorine-19, that is 19 − 9 = 10 neutrons.
How to draw the Bohr model of fluorine
- Draw the nucleus and write 9 p⁺ y 10 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 7 electrons on it.
- Check: 2 + 7 = 9 electrons, the same as the number of protons.
Electron configuration
The electron configuration of fluorine is [He] 2s² 2p⁵. Its 7 outer electrons decide how it reacts: it tends to gain 1 more, forming F⁻ ions.
Key facts about fluorine
| Symbol | F |
|---|---|
| Atomic number | 9 |
| Relative atomic mass | 18.998 |
| Group · period · block | group 17 · period 2 · p-block |
| Tipo | Halógeno |
| State at 25 °C | gas |
| Capas electrónicas | 2, 7 |
| Electron configuration | [He] 2s² 2p⁵ |
| Electrones de valencia | 7 |
| Common ion | F⁻ |
| Electronegativity (Pauling) | 3.98 |
| First ionisation energy | 17.42 eV (1681 kJ/mol) |
| Atomic radius (empirical) | 50 pm |
¿Dónde fluorine sits on the periodic table
Preguntas frecuentes
How many protons, neutrons and electrons does fluorine have?
Fluorine has 9 protons and 9 electrons (atomic number 9). Its most common isotope, fluorine-19, has 19 − 9 = 10 neutrons.
What is the electron configuration of fluorine?
[He] 2s² 2p⁵. In shells that is 2, 7.
How many valence electrons does fluorine have?
7. Fluorine is in group 17, and its outer shell holds 7 electrons.
Where is fluorine on the periodic table?
In group 17, period 2, in the p-block. It is a halogen.
