In IIIA group, Tl (thalium) shows +1 oxidation state while other … - Vidyadip

MCQ

In $IIIA$ group, $Tl$ (thalium) shows $+1$ oxidation state while other members show $+3$ oxidation state. Why

A
Presence of lone pair of electron in $Tl$
✓
Inert pair effect
C
Large ionic radius of $Tl$ ion
D
None of these

✓

Answer

Correct option: B.

Inert pair effect

b
(b) Inert pair effect become significant for the $6^{th}$ and $7^{th}$ period of $p$ -block element.

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