Question

what is inert pair effect?​

Answer 1

The inert-pair effect refers to the empirical observation that the heavier elements of groups 13–17 often have oxidation states that are lower by 2 than the maximum predicted for their group. For example, although an oxidation state of +3 is common for group 13 elements, the heaviest element in group 13, thallium (Tl), is more likely to form compounds in which it has a +1 oxidation state

Answer 2

hey mate here is ur answer___
Inert Pair Efect__
It is often used in relation to the increasing stability of oxidation states that are two less than the group valency for the heavier elements of group 13,14,15 &16.