1. Tardigrade
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  4. The group 13 elements react with halogens to form trihalides except

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Q. The group $13$ elements react with halogens to form trihalides except

The p-Block Elements

Solution:

The elements of group $13$ react with halogens to form trihalides (except $TlI _{3}$ ). $Tl$ forms $TlI$ instead of $TlI _{3}$.
The reaction is given below :
$2 E(s)+3 X_{2}(g) \longrightarrow 2 E X_{3}(s)\,\, [X= F , Cl , Br , I ]$