Who's good at explaining chemistry?

vanessa8302

New member
While naming chemical formulas I had a problem.

Copper (II) Nitride
Lead (IV) Oxide

I assumed it was Cu(2+) and N(3-) and once you switch them around you get Cu3N2. But the correct answer is Cu3N. What am I doing wrong???

And also I thought it was Pb(4+) and O(2-) to be Pb2O4, but the correct answer is PbO2.

I'm so confused, if anyone could explaining the right way, thanks in advance!
 
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