Question

the valency of aluminium and nitrogen is 3, then how do they differ​

Answer 1

Answer:

In this, each aluminium atom is surrounded by four nitrogen atoms and each nitrogen atom by four aluminium atoms. The triple valency of each aluminium atom is therefore shared with four nitrogen atoms, so there is only three quarters of a bond between each aluminium atom and nitrogen atom (Table 3).

Answer 2

Answer:

Eventhough the valency of aluminium and nitrogen is 3 they have different         number of electrons in their valence shells. Aluminium has 3 valence  electrons whereas nitrogen has 5 valence electrons. Thus with 3 valence electron aluminium is a metal and with 5 valence electrons nitrogen is a    non- metal.

Moreover they belong to different group and different periods.

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