Complete the statement.
Fluorine is ().

 - a compound
 - an elementary substance
You can tell whether fluorine is an elementary substance or a compound by counting the number of atomic symbols in its chemical formula. An atomic symbol consists of either one capital letter or a capital letter followed by one or two lowercase letters.
The chemical formula for fluorine, F2, contains one atomic symbol: F. So, the formula tells you that fluorine is composed of only one chemical element.
Since fluorine is composed of only one chemical element, fluorine is an elementary substance.