Question

Aluminium is the element of group 13 and has three electrons in its outermost shell. How do you justify that AlCl3 needs an electron pair?​

Answer 1

Answer:

Aluminum, gallium, indium, and thallium have three electrons in their outermost shell (a full s orbital and one electron in the p orbital) with the valence electron configuration ns2np1. The elments of the boron family adopts oxidation states +3 or +1. The +3 oxidation states are favorable except for the heavier elements, such as Tl, which prefer the +1 oxidation state due to its stability; this is known as the inert pair effect. The elements generally follow periodic trends except for certain Tl deviations:

Explanation:

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Answer 2

Answer:

in order to complete outermost shell it needs to loos 3 electrons