The following list contains some common radicals. using the charges on these ions and the idea of valence, predict the formulas for the following:
1. nitrate no3-1 phosphate po4-3
2. sulfate so4-2 acetate c2h3o2-1
3. ammonium nh4+ chromate cro4-2
4. carbonate co3-2 dichromate cr2o7-2
5. permanganate mno4-1 sulfide s-2
6. sodium carbonate
7. potassium permanganate
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