Question

give reason for trivalency and monovalency in group13 elements​

Answer 1

Explanation:

Trivalency:-the elements of group 13 have ns2 np1 outermost electronic configuration thus their valency is +3 . B (boron); Al;Ga.

monovalency:-It is due to Inert pair effect .

The tendency of ns electron to take part in a chemical reaction decreases while going down the group .this is called inert pair effect.thus In;Tl have +1 valency .