Amongst the following, the total number of species NOT having eight...

Among the given species ${NH}_{3}$ and ${CCl}_{4}$ is having eight electrons at the central atoms. In ammonia, one lone pair and three bond pairs at nitrogen. In carbon tetrachloride four bond pairs are present.

In ${AlCl}_{3}$, aluminium has three bond pairs, i.e., it has incomplete octet.

In ${BeCl}_{2}$, beryllium has two bond pairs, i.e., it has incomplete octet.

In ${PCl}_{5}$, phosphorus has five bond pairs, i.e, it has expanded octet.