Answer:
ZnCO3
Explanation:
So since Zinc is a transition metal, and has 2+ ions, which is why it has II.
Carbonate is written as CO3 2-
Now the way to combine both of the ions it to cancel out the charges. Since both of them is 2+ and 2-, you just need one each to cancel the charge, therefore the formula is
ZnCO3
If lets say I had Cu(I) and CO3 2-, the (I) means Cu+, and since Carbonate has 2- and copper has 1+, you need 2 copper ions to cancel out, therefore the formula for that would be
Cu2CO3.
Hope that answers your question