Here's why:

* Pb represents the element lead.

* Br represents the element bromine.

* The subscript 4 indicates that there are four bromine atoms for every lead atom.

* Lead(IV) indicates that the lead atom has a +4 oxidation state. This is important because lead can have multiple oxidation states, so we need to specify which one it is in this compound.

Therefore, the full name is lead(IV) bromide.