Which element of group 13 does not show the g | vedclass

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(D) The group valency of group $13$ elements is $+3$. As we move down the group,the stability of the $+1$ oxidation state increases due to the inert p

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Thallium

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(D) The group valency of group $13$ elements is $+3$. As we move down the group,the stability of the $+1$ oxidation state increases due to the inert pair effect. Thallium $(Tl)$ shows both $+1$ and $+3$ oxidation states,but the $+1$ oxidation state is more stable than the $+3$ oxidation state. Therefore,$Tl$ is the element that often does not exhibit the group valency of $+3$ in its stable compounds.

Which element of group $13$ does not show the group valency in its compounds?

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