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FeO= Fe +2 y O -2
CaO= Ca+2 y O -2
CH4= C -4 e H+1
Cl2= +-1, 3, 5 y 7
FeO: Fe=+2 O=-2
CaO: Ca=+2 O=-2
CH4: C= -4 H= +1
Cl2= 0 porque esta en estado molecular