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Na + Cl = 0
1 + Cl = 0
Na = +1 Cl = -1
b. HClO3
H + Cl + 3O = 0
1 + Cl + 3(-2) = 0
cl = +5
c. CaH2
Ca + 2H = 0
2 + 2H = 0
H = -1
d. H2O2
2H + 2O = 0
2.1 + 2O = 0
O = -1
e.K2SO4
2K + S + 4O = 0
2.1 + S + 4(-2) = 0
S =+6
f.K2O
K = +1 O = -2
g. OF2
O + 2F = 0
O +2(-1) = 0
O = +2
h. Na3PO4
3Na + P + 4O = 0
3.1 + P + 4(-2) = 0
P = +5
i. K2Cr2O7
2K + 2Cr + 7O = 0
2.1 + 2Cr + 7(-2)=0
Cr = +6