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The systematic name for NH₃ is "nitrogen trihydride." This name follows the rules for naming covalent compounds, where the element with the lower electronegativity is named first, followed by the element with higher electronegativity, with the ending "-ide" for the second element. In this case, nitrogen (N) has lower electronegativity than hydrogen (H), so it comes first, and the ending "-ide" is added to hydrogen. The prefix "tri-" indicates that there are three hydrogen atoms in the molecule.