Jawabanmu

2014-02-02T22:26:34+07:00
A. Ca(ClO₃)₂
Ca = +2
O = -2
Cl = +5

b. Cu(NO₃)₂
Cu = +2
N = +5
O = -2

c. Cr₂O₇²⁻
Cr = +6
O = -2

d. S₂O₇²⁻
S = +6
O = -2

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