Final answer:
The compound Pb(Cr2O7)2 is called lead(IV) dichromate. It combines the lead cation in a +4 oxidation state with the dichromate anion. This nomenclature comes from the respective ions' composition and oxidation states.
Step-by-step explanation:
The name of the compound Pb(Cr2O7)2 is lead(IV) dichromate. In this compound, lead is in the +4 oxidation state, as indicated by the IV, and the dichromate ion is Cr2O72-. To properly name the compound, we combine the name of the cation, lead(IV), with the name of the anion, dichromate.
The dichromate ion itself results from the combination of two chromium atoms and seven oxygen atoms, which is clearly shown in the chemical formula. When writing formulas for compounds using the crisscross method, as shown with examples such as lead (IV) oxide with the formula PbO2, it is crucial to employ the correct oxidation states to achieve the proper chemical formula. Understanding the ionic nature of compounds like Pb(Cr2O7)2 and how they dissociate in water provides vital insight into their chemical behavior.