define. elements. compounds. and. mixtures. std8. chap- compositions of. matter
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element = an element is a pure substance which cannot be broken down by chemical means, consisting of atoms which have identical numbers of protons in their atomic nuclei.
compounds = A chemical compound is a chemical substance composed of many identical molecules composed of atoms from more than one element held together by chemical bonds.
mixtures = a mixture is a material made up of two or more different substances which are physically combined.
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