define: 1)atom (2)molecule (3)formula (4)atomicity
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1) Atom: An atom is the smallest indivisible unit of an
OR
Atom is the smallest unit of matter.
2)Molecule: Molecule is the smallest unit of a compound (or an element) which always has an independent existence.
3) Formula:Formula is a group of mathematical symbols that express a relationship or that are used to solve a problem, or a way to make something.
4)Atomicity: Atomicity is defined as the total number of atoms present in a molecule.
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