Molecules and compounds - Khan Academy
https://www.khanacademy.org/science/chemistry/atomic-structure-and-properties/introduction-to-compounds/a/paul-article-2
WebIn covalent compounds, atoms form covalent bonds that consist of electron pairs shared between two adjacent atomic nuclei. An example of a covalent compound is ammonia. The chemical formula of ammonia is NH 3 , which tells us that in a single molecule of ammonia, there is one nitrogen atom, and three hydrogen atoms.
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