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atom

smallest particle that still has the chemical characteristics of an element

element

pure substance made up of only one type of atom

molecule

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

compound

the chemical combination of two or more elements

covalent bond

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

electron

negatively charged particle; gives an element its chemical properties

ion

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

pH

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

acid

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

base

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

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