chemical bond: a link that atoms or electrically charged particles can form with each other
chemical formula: a way of using letters and numbers to show how much of each element is in a substances
ion: an electrically charged particle with unequal numbers of prtons and electrons
molecule: a group of bonded atoms that acts like a single particle
Chemical property: a way of describing how a substance changes chemically with other substances
exothermic: a reaction that gives off heat
endothermic: a reaction that absorbs heat
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