| Term | Definition |
|---|
| stoichiometry | the mathematical relationships between reactants and products in a chemical reaction |
| mole | a quantity used to count atoms, molecules, formula units, or ions; equal to Avogadro's number or 6.022 x 10^23 |
| molar mass | the mass in grams of one mole of a pure substance |
| formula mass | the sum of the masses of all elements in a formula |
| atomic mass | the average of the masses of all known isotopes of an element |
| molecule | the smallest particle of a covalent compound |
| ion | a charged particle consisting of one or more elements |
| formula unit | the smallest particle of an ionic compound |
| atom | the smallest particle of an element |
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