In $IIIA$ group, $Tl$ (thalium) shows $+1$ oxidation state while other members show $+3$ oxidation state. Why
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 $Tl$
- B
Inert pair effect
- C
Large ionic radius of $Tl$ ion
- D
None of these
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