What is the name of the compound with the formula PbCO3?
It is Lead Carbonate, but to be more specific, it is Lead (II)
Carbonate.
Lead can have a charge of +2 or +4. A carbonate ion has a charge
or -2. So, in order for the chemical formula to be PbCO3 the lead
ion must have a charge of +2, hence the (II) between the lead and
carbonate.