The word “atom” literally means “indivisible” or “uncuttable,” coming from the Ancient Greek word átomos formed from a- (“not”) and temnein (“to cut”). In modern science, an atom is the smallest unit of a chemical element that still keeps that element’s identity, consisting of a nucleus with protons and neutrons, surrounded by electrons.

In everyday English, “atom” is also used more loosely to mean a very tiny amount of something, as in “not an atom of doubt.”

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