What is cuso4 ionic with polyatomic
ions and roman numerals

Explanation:

So since SO4 has a charge of -2 you cross multiply and that goes to the Cu and if you look at the reference table Cu does have a positive 2 charge.So since Roman numerals only go with transitional metals which is groups 3 to 12 on the reference table you put Roman numerals with Cu.Now since the equation is CU2S04 you write copper since Cu stands for copper then you write (II) sulfate ( you get sulfate by looking at the reference table table e).basically the final answer should be copper (II) sulfate

since electrons are negative the answer is neagtaive