Witch Background 1

Term Definition
Proton positively charged particle in the nucleus of an atom
Neutron neutral particle in the nucleus of an atom
Electron particle with a single negative charge
Nucleus positively charged, central part of atom
Atomic number number of protons
Average atomic mass average mass of the element's isotopes
Ionic bond gain or loss of electrons
Covalent bond two atoms share valence electrons
Exothermic reaction chemical reaction that releases energy
Endothermic reaction chemical reaction that absorbs energy
Rate of reaction speed at which a reaction occurs
Catalyst substance that speeds up a chemical reaction

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