Explanation:
Fluorine exists as a diatomic gas and its chemical formula is [tex]F_{2}[/tex]. Whereas calcium exists in solid state and has a chemical formula Ca.
Therefore, when fluorine gas reacts with calcium metal then it results in the formation of compound calcium fluoride.
The chemical reaction will exist as follows.
[tex]Ca(s) + F_{2}(g) \rightarrow CaF_{2}(s)[/tex]
