particulate level: level of atoms and molecules
atoms: the building blocks of matter
element: matter that is made up of only one kind of atom
compound: a substance that is composed of the atoms of two different elements linked together chemically
chemical formulas: an expression that shows the elements that are contained in a substance with the subscripts that indicate the number of atoms of each element
substance: has a uniform and definite composition as well as distinct properties
molecule: the smallest unit of a molecular compound that retains the properties of that substance
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