First slide
Periodicity in atomic properties
Question

Which of the following species are hypervalent ?

 (1) ClO4          (2) BF3          (3) SO42            (4) CO32

Moderate
Solution

 In ClO4,no. of eat Cl atom =7+7=14e.In SO42,No. of eat ' S ' atom =6+6=12e

 These are more than 8e, therefore hypervalent. 

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