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
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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