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why do aluminium, gallium and indium form trihalides with halogens but thallium does not?

why do aluminium, gallium and indium form trihalides with halogens but thallium does not?

Grade:12th pass

1 Answers

Mahima Kanawat
1010 Points
6 years ago
Dear student , Due to inert pair effect the ns electrons of thallium does not partcipate in bonding and remain inert. So , Th forms +1 instead of +3 and therefore does not form trihalides . With Regards ....mahima ....Askiitians forum expert

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