Final answer:
The systematic name of NH4ClO3 is ammonium chlorate, which is derived from the combination of the ammonium ion (NH4+) and the chlorate ion (ClO3-).
Step-by-step explanation:
The systematic name of NH4ClO3 is ammonium chlorate. This naming convention comes from the combination of the cation (NH4+, the ammonium ion) and the anion (ClO3−, the chlorate ion). It follows the standard rules of ionic compound nomenclature where the metal or positively charged polyatomic ion (in this case, ammonium) is named first, followed by the name of the nonmetal or negatively charged polyatomic ion (here, chlorate) with its ending changed to -ate.