Solve this following

Aluminium is usually found in $+3$ oxidation stagte. In contarast, thallium exists in $+1$ and $+3$ oxidation states. This is due to :


  1. lanthanoid contraction

  2. lattice effect

  3. diagonal relationship

  4. inert pair effect

Correct Option: , 4


Inert pair effect is promenent character of pblock element.


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