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 protons and electrons:
Molecule: A group of bonded atoms that acts liki a single particle.
Chemical property: A way of describing how a substance changes chemically with otherb subtance.
Exothermic: A reaction thet gives off heat.
Endothermic: A reaction that absorbs heat.
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