Fluorine (F) — Halogen. Atomic number 9.
Pale yellow gas
- Atomic number: 9
- Symbol: F
- Atomic mass: 18.998 u
- Category: Halogen
- State: Gas
- Melting point: -219.62 °C / 53.53 K
- Boiling point: -188.12 °C / 85.03 K
- Density: 1.55e-3 g/cm³ (20°C)
- Electron configuration: [He] 2s2 2p5
- Oxidation states: −1
- Electronegativity: 3.98
- Discovered by: Henri Moissan (1886)
Common uses: Fluoropolymers, Toothpaste compounds, Uranium processing, Etching
Biological role: Trace amounts help strengthen tooth enamel.
Frequently Asked Questions about Fluorine
What is the atomic number of fluorine?
Fluorine has an atomic number of 9, meaning each atom contains 9 protons in its nucleus.
What is the atomic mass of fluorine?
The standard atomic weight of fluorine is 18.998 u (unified atomic mass units).
What category does fluorine belong to?
Fluorine is classified as a halogen.
What is the state of fluorine at room temperature?
Fluorine is a gas at 20 °C (68 °F).
What is the melting point of fluorine?
The melting point of fluorine is -219.62 °C / 53.53 K.
What is the boiling point of fluorine?
The boiling point of fluorine is -188.12 °C / 85.03 K.
What is the density of fluorine?
The density of fluorine is 1.55e-3 g/cm³ (20°C).
What is the electronegativity of fluorine?
Fluorine has a Pauling electronegativity of 3.98.
What is the electron configuration of fluorine?
The electron configuration of fluorine is [He] 2s2 2p5.
What are the common oxidation states of fluorine?
Fluorine commonly exhibits the following oxidation states: −1.
When was fluorine discovered?
Fluorine was discovered in 1886 by Henri Moissan.
Is fluorine radioactive?
Fluorine is a stable element with no naturally occurring radioactive isotopes.
What is the biological role of fluorine?
Trace amounts help strengthen tooth enamel.
What are the common uses of fluorine?
Fluorine is used for: Fluoropolymers; Toothpaste compounds; Uranium processing; Etching.
