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 substance.
Ion: an electrically charged particle with unequal numbers of prtons and electrons.
Molecule: a group of bonded atoms that acts like a single patricle.
Chemical property: a way of describing how a substance changes chemically with other substances.
Exothermic: a reaction that give off heat.
Endothermic: a reaction that absorbs heat.
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