For the similarly named compound, please see Ammonia.

Ammonium (NH4+) is a positively charged ion comprised of four molecules of hydrogen and one molecule of nitrogen.

Manure consists of potassium nitrate, ammonium, and methane. (VOY: "The 37's")

In 2376, B'Elanna Torres detected elevated levels of carbon monoxide and ammonium on Kelemane's planet during a series of scans, indicating evolutionary progress by the planet's inhabitants. (VOY: "Blink of an Eye")

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