Here's why:

* Co represents the element cobalt.

* F represents the element fluorine.

* The subscript 2 indicates that there are two fluorine atoms for every one cobalt atom.

* Since cobalt can have different oxidation states, we need to specify the oxidation state of cobalt in this compound. The Roman numeral (II) indicates that cobalt has a +2 charge.

Therefore, the full name is cobalt(II) fluoride.