9 F 18.998
Fluorine
diatomic nonmetal
Properties
- Atomic number
- 9
- Atomic mass
- 18.998 u
- Category
- diatomic nonmetal
- Group
- 17
- Period
- 2
- Block
- p-block
- State (room temp)
- Gas
- Outer-shell electrons
- 7
- Electronegativity
- 3.98 (Pauling)
- Density
- —
- Melting point
- -219.67 °C
- Boiling point
- -188.12 °C
Electron configuration
1s² 2s² 2p⁵
Noble-gas shorthand: [He] 2s² 2p⁵
Electrons per shell: 2, 7 — that's 7 in the outermost shell.
About Fluorine
Fluorine is a chemical element with symbol F and atomic number 9. It is the lightest halogen and exists as a highly toxic pale yellow diatomic gas at standard conditions. As the most electronegative element, it is extremely reactive:almost all other elements, including some noble gases, form compounds with fluorine.
- Discovered by André-Marie Ampère
- Named by Humphry Davy
Position in the periodic table
Data compiled from Wikipedia, PubChem, and IUPAC. Source.