Which of the following elements does not exhi | vedclass

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(A) Alkaline earth metals,such as $Barium$ $(Ba)$,belong to group $2$ of the periodic table and possess a stable electronic configuration of $ns^2$. T

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Barium

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(A) Alkaline earth metals,such as $Barium$ $(Ba)$,belong to group $2$ of the periodic table and possess a stable electronic configuration of $ns^2$. They typically exhibit a fixed valency of $+2$ and do not show variable valency. In contrast,transition elements like $Titanium$ $(Ti)$ and $Copper$ $(Cu)$,as well as post-transition elements like $Lead$ $(Pb)$,exhibit variable valency due to the involvement of $d$ or $f$ electrons or inert pair effects.

Which of the following elements does not exhibit variable valency?

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