Chemical element
Fluorine
- F
- Z = 9
- halogen
Fluorine (F) is element 9, a halogen in period 2 and group 17. Its standard atomic weight is 18.998 Da. Weights follow IUPAC standard atomic weights, 2021 revision.
Identity
SymbolF
Standard atomic weight18.998atomic mass units (Da)
Mass in kilograms3.1546921 × 10^-26
Categoryhalogen
Group17
Period2
Blockp-block
Electrons in a neutral atom9
Neutrons in the most common isotope10≈
Quantities
Molar mass18.998 g/mol
Mass of one mole18.998 grams
Atoms in one gram3.1698814 × 10^22
Mass of one atom3.1546921 × 10^-23 g
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