Use the drop-down menus to complete the statements. ___are pure substances that cannot be broken down into a simpler form. ____ are units of two or more atoms. ___ are the smallest possible particles of

Use the drop-down menus to complete the statements. ___are pure substances that cannot be broken down into a simpler form. ____ are units of two or more atoms. ___ are the smallest possible particles of an element. ___are pure substances made of two or more atoms of different elements.

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