Which element forms unstable trihalides?

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(A) Among the group $15$ elements,nitrogen $(N)$ forms unstable trihalides like $NF_3$ (which is stable) but $NCl_3$,$NBr_3$,and $NI_3$ are highly uns

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$N$

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(A) Among the group $15$ elements,nitrogen $(N)$ forms unstable trihalides like $NF_3$ (which is stable) but $NCl_3$,$NBr_3$,and $NI_3$ are highly unstable and explosive. This is primarily due to the small size of the nitrogen atom and the weak $N-X$ bond strength compared to the $N-N$ bond or the steric repulsion between the halogen atoms.

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