1.

Which is more stable among Tl^(+3) and Tl^(+1). Why?

Answer»

Solution :`Tl^(1+)` is more stable than `Tl^(3+)` . It is DUE to inert pair effect.
With increases in SIZE of atom in a GROUP. The s electrons present in the outermost orbit are reluctant in involving bond FORMATION.
Hence, in thallium, only p ELECTRON involves in bond formation.


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