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Unit 3 Study Guide Vocabulary Electron Proton Neutron Isotope Ion Cation Anion Mass Number Average Atomic Mass Atomic Number Diatomic Element What are the diatomic molecules? Formula Molecule Periodic Table Locate the following families: Transition metals, Halogens, Noble gas, metalloid, alkaline metal, alkaline earth metal Metals, nonmetals Apply: Be able to fill out a chart with given information: Atom or ion Symbol Atomic # # Protons # Electrons # Neutrons Mass #