Fluorine (F)
Fluorine (F, element 9) is a halogen in group 17, period 2. Atomic mass 18.998, electron configuration [He] 2s² 2p⁵, uses and facts.
About Fluorine
Fluorine is a halogen with the symbol F and atomic number 9. It is a gas at room temperature, and it sits in group 17, period 2 of the periodic table. Fluorine was discovered in 1886 by Henri Moissan.
Fluorine key facts
- Atomic number: 9
- Symbol: F
- Atomic mass: 18.998 u
- Category: halogen
- Group: 17
- Period: 2
- State at room temperature: gas
- Electron configuration: [He] 2s² 2p⁵
- Electronegativity (Pauling): 3.98
- Melting point: 53.53 K (-219.62 °C)
- Boiling point: 85.03 K (-188.12 °C)
- Density: 0.001696 g/cm³
- Common oxidation states: −1, 0
Electron configuration
The electron configuration of fluorine is [He] 2s² 2p⁵. The part in brackets is the noble gas core; the rest shows how the outer electrons fill their subshells. Fluorine has 7 valence electrons.
Uses of fluorine
- Toothpaste
- Teflon
- Pharmaceuticals
Did you know?
Most reactive and electronegative of all elements. It attacks glass and reacts with noble gases.
Other elements in group 17 and neighbours
Frequently asked questions
What is the atomic number of fluorine?
The atomic number of fluorine is 9, which means every fluorine atom has 9 protons.
What is the electron configuration of fluorine?
The electron configuration of fluorine is [He] 2s² 2p⁵.
What group and period is fluorine in?
Fluorine is a halogen in group 17, period 2.
What state is fluorine at room temperature?
Fluorine is a gas at room temperature.
What is fluorine used for?
Fluorine is used for toothpaste, teflon, pharmaceuticals.