Which of the following elements does not exhi | vedclass

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(B) The inert pair effect is the tendency of the two electrons in the outermost $s$-orbital to remain unshared in compounds of post-transition metals.

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Aluminium

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(B) The inert pair effect is the tendency of the two electrons in the outermost $s$-orbital to remain unshared in compounds of post-transition metals. This effect becomes more prominent as we move down a group in the $p$-block elements due to poor shielding of $d$ and $f$ orbitals. $Al$ (Aluminium) belongs to group $13$ and is a light element. It does not have $d$ or $f$ electrons to cause poor shielding,and therefore,it does not exhibit the inert pair effect. It consistently shows an oxidation state of $+3$.

Which of the following elements does not exhibit the inert pair effect?

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