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Biloks O = -2
Biloks C + 3.biloks O = -2
Biloks C + 3(-2) = -2
Biloks C - 6 = -2
Biloks C = +4
b. NaO₄⁻
Biloks Na = +1
Biloks Na + 4.biloks O = -1
1 + 4.biloks O = -1
4.biloks O = -2
Biloks O = -1/2
c. OCl⁻
Biloks O = -2
Biloks O + Biloks Cl = -1
-2 + Biloks Cl = -1
Biloks Cl = +1
d. Cu²⁺
Biloks Cu = +2
e. S₂O₃²⁻
Biloks O = -2
2.Biloks S + 3.biloks O = -2
2.Biloks S + 3(-2) = -2
2. Biloks S - 6 = -2
2. Biloks S = +4
Biloks S = +2
f. ClO₄⁻
Biloks O = -2
Biloks Cl + 4.Biloks O = -1
Biloks Cl + 4(-2) = -1
Biloks Cl - 8 = -1
Biloks Cl = +7