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moleculeclick to hear

Matter composed of atoms that constitutes the smallest unit of a pure body that can exist in a free state (e.g., water and carbon dioxide).
molecule chemical bond atoms

chemical bond click to hear

Force that unites two atoms through the sharing of a common electron (covalent bond) or the transfer of electrons (ionic bond) to form a molecule.

atoms click to hear

All matter in the universe is composed of approximately 100 types of atoms.