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S = 6+
O = 2 ⇒ O4 = 8-
b. K = 1+ ⇒ K2 = 2+
Cr = 6+ ⇒ Cr2 = 12+
O = 2- ⇒ O7 = 14-
b. biloks Cr dalam K2Cr2O7= +6