I NEED HELP!!!!
Given the table below, what is the chemical formula for a compound between Na and the sulfate ion SO4 -2?
A. nitrate ion NO3 -1
B. phosphate PO4 -3
C. sulfate SO4 -2
D. acetate C2H3O2 -1
E. ammonium NH4 +1
F. chromate CrO4 -2
G. carbonate CO3 -2
H. dichromate Cr2O7 -2
I. permanganate MnO4 -1
J. sulfite SO3 -2