# Question #d8229

Aluminium nitride is the name ending with "nitride".So it is a binary compound composed of Aluminum and nitrogen.Aluminium is less electronegative than nitrogen and has got same valency(=3) as that of nitrogen.Hence the formula of Aluminium nitride is $A L N$
The name aluminium nitrite ends with "nitrite".So this contains compound radical,nitrite $N {O}_{2}^{-}$ composed of nitrogen and oxygen and the oxidation state of nitrogen in the radical is +3.It has valency 1.
Hence its formula is $A l {\left(N {O}_{2}\right)}_{3}$