Question

An ________ molecular ion peak usually indicates the presence of an odd number of nitrogen atoms in the molecule.

Answer 1

odd

Step-by-step explanation:

By applying the Nitrogen rule; A molecular ion with odd mass numbers will contain an odd number of a nitrogen atom, however, a molecular ion with an even mass number will contain either an even number of a nitrogen atom or no nitrogen.

So from the given information, the missing word is odd .