How Isotopes Are Used by Biologists (1105 words, 5 pages)
CHP 2 ATOMS, MOLECULES AND BONDSDefine element, atom, compound, molecule, and trace element.ELEMENT a substance that cannot be broken down to other substances by chemical reactions. COMPOUND a substance consisting of two or more elements combined in a fixed ratio.MOLECULE two or more atoms held together by covalent bondsTRACE ELEMENTS ...
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