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biloks S + 3 × biloks O = -2
biloks S + 3 × -2 = -2
biloks S = +4
2. Cu2O
2 × biloks Cu + biloks O = 0
2 × biloks Cu + (-2) = 0
biloks Cu = +1
3. SnCl4
biloks Sn + 4 × biloks Cl = 0
biloks Sn + 4 × (-1) = 0
biloks Sn = +4