The idea that matter is made up of atoms and molecules provides the basis for understanding the properties of matter.
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Recognize that all substances are composed of one or more of approximately one hundred elements and that the periodic table organizes the elements into groups with similar properties.
Describe the differences between elements and compounds in terms of atoms and molecules.
Recognize that a chemical equation describes a reaction where pure substances change to produce one or more pure substances whose properties are different from the original substance(s).