Fluorine is an extremely reactive halogen that occurs naturally only in compounds such as fluorite and fluorapatite.
Atomic number
9
Category
Halogen
Period
2
Group
17
State
Gas
Fun facts about Fluorine
It has the highest electronegativity of any element.
Elemental fluorine is a pale yellow, corrosive gas.
Fluoride can strengthen tooth enamel at carefully controlled concentrations.
Common uses of Fluorine
Fluoropolymer manufacture
Uranium processing
Fluoride dental products
Where Fluorine sits in the periodic table
Fluorine is classified as a halogen in period 2 and group 17 of the periodic table. Under the conditions represented in this reference, its state is gas.
Quick chemistry revision
For quick revision, pair the symbol F with atomic number 9 and the listed atomic mass 18.998. The summary, facts, and uses above keep those element properties together in one reference.