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smallest particle that still has the chemical characteristics of an element


pure substance made up of only one type of atom


two or more atoms bonded together; smallest unit of a compound


the chemical combination of two or more elements

covalent bond

type of bond formed when adjacent atoms share a pair of electrons


negatively charged particle; gives an element its chemical properties


an atom with a charge because it has lost or gained an electron


measure of acidity or alkalinity of a substance; the amount of H+ ions in a solution


substance with a pH below 7; has a high amount of H+ ions


substance with a pH above 7; tends to have low H+ and/or high OH- ions

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