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Bio Strats List #3

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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