physical substance that occupies space and possesses rest mass.

the basic unit of a chemical element.

a group of atoms bonded together, representing the smallest part of an element.

each of one hundred or more substances that cannot be broken down into a simpler form.

a substance that is composed of two or more elements.

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Matter

Term	Definition
Matter	physical substance that occupies space and possesses rest mass.
Atom	the basic unit of a chemical element.
Molecule	a group of atoms bonded together, representing the smallest part of an element.
Element	each of one hundred or more substances that cannot be broken down into a simpler form.
Compound	a substance that is composed of two or more elements.