atom

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Simple English Wikipedia has an article on:

Pronunciation [change]

  • IPA: /ˈætəm/

Noun [change]

Singular
atom

Plural
atoms
  1. (countable) An atom is the smallest bit that matter can be broken down into.
    Atoms of hydrogen make up a water molecule.
  2. A particle which is made up of protons, neutrons, and electrons.
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