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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Lingareddy 1
in P-block elements last period element's Tl, pb, bi, po shows inert pair effect. they exhibit +1 oxidation state or +1oxidation state morestable The inert-pair effect is the tendency of the two electrons in the outermost atomic s-orbital to remain unshared in compounds of post-transition metals. ... As a result, the inert pair of ns electrons remains more tightly held by the nucleus and hence participates less in bond formation.