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    Inert pair effect is the account of increasing tendency of s electrons not to take part in bonding as atomic size increases.However, how s electrons don't take part in bonding no matter what as atomic size increase.

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    Sorry what's your question?

    s electrons do take part in bonding - take carbon for example (configuration 2s22p2) it promotes an s electron to the vacant 2p orbital leaving four unpaired electrons which it can then form 4 bonds with. As you go down group 14 then the ability of an element (say tin) to promote this electron is reduced - leaving only 2 unpaired electrons for bonding - so we say the two s electrons are the inert pair.
 
 
 
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