mass. An element is a substance that cannot be broken down into other substances by chemical reactions. (E.g. gold, copper, carbon, oxygen) A compound is a substance consisting of two or more elements combined in a fixed ratio. (e.g. H2o and table salt NaCI) C, H, O, N make up 96% of living matter. Trace elements are those required by an organism in only minute quantities (e.g. iron and iodine) **Matter consists of chemical elements in pure form and in combos called compounds** Atoms are the…
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