Answer
The chemical formula of the most likely product is $CaF_2$.
Work Step by Step
We see that to satisfy every atom so that every atom can reach an octet, in this case, 2 $F$ atoms have to be involved with 1 $Ca$ atom in the reaction.
The oppositely charged ions after the reaction would create bonds among all 3 atoms.
Therefore, the most likely product of the reaction would be a compound with 1 $Ca$ atom and 2 $F$ atoms. That means the chemical formula would be $CaF_2$.
