Atom

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[a-tuhm]
The most basic unit of chemistry. Atoms of different elements have a different number of protons, neutrons, and electrons.

Related Articles:
  • Glossary: Ion
    An atom or molecule that has an electric charge, due to an unequal number of protons and electrons.
  • Glossary: Molecule
    When two or more atoms join together. For example, ozone (O3) is a molecule because it has more than one oxygen atom.
  • Glossary: Nutrient
    Any atom, molecule, or ion that aids an organism in living, growing, and reproducing.
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