(i) S₂ ^2- (ii) OCl- (iii) CN-

 (1) (i) S and S^2– The number of valence electrons in sulphur is 6. The Lewis dot symbol of sulphur (S) is  . 

The dinegative charge infers that there will be two electrons more in addition to the six valence electrons.Hence, the Lewis dot symbol of S^2– is .

 (ii) Al and Al3+ The number of valence electrons _____ __________ __________ ____ __________ ________ _________.
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