Which one of the following elements does not | vedclass

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(B) Boron $(B)$ is a non-metal and does not form a stable triiodide $(BI_3)$ under standard conditions due to its small size and high ionization energ

Vedclass · Accepted Answer

$Tl$

Vedclass · Answer

(B) Boron $(B)$ is a non-metal and does not form a stable triiodide $(BI_3)$ under standard conditions due to its small size and high ionization energy, although $BI_3$ can be synthesized under specific conditions. However, in the context of group $13$ elements and the inert pair effect, $Tl$ (Thallium) is the most distinct. $Tl$ prefers the $+1$ oxidation state over the $+3$ state due to the inert pair effect, making $TlI_3$ highly unstable and it readily decomposes into $TlI$ and $I_2$. Thus, $Tl$ does not form a stable triiodide.

Which one of the following elements does not form triiodide on reacting with iodine?

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