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CBSE Class 12-science Answered

what is inert-pair effect?
Asked by Yatin gupta | 31 Dec, 2012, 12:58: AM
Expert Answer
Inert pair effect: 
The tendency of the outermost s electrons to remain non ionized or unshared in post-transition compounds is called inert pair effect. The term inert pair effect is often used to the increasing stability of oxidation states which is 2 less than the group valency for the heavier elements of groups especially 13, 14, 15 and 16.
 
 The inert pair effect explains why common ions of Pb are Pb4+and Pb2+, and not just Pb4+ as we might expect from the octet rule.
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