Custom Search Lewis Dot of Ammonia NH3 Since all the atoms are in either period 1 or 2, this molecule will adhere to the octet rule. The exception, of course, being the hydrogen's. They follow the duet rule (2 electrons). Ammonia is a colorless gas with a distinct odor. Household ammonia is NH3 in water or "ammonium hydroxide". Most ammonia today is used as fertilizer.
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