Inert paired effect : It is the non participation of s-pair of electron in the bond formation due to poor screening or shielding of d and f orbitals.
Consequence of inert paired effect :
1) Due to inert paired effect lower oxidation state of elements of group of "p" block becomes more stable.
exam:-In group 13, +1 oxidation state becomes more stable in Indium and Thallium due to inert paired effect.
2) Due to inert paired effect f-block shows lanthanoid and actinoid contraction.
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