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  1. Periodic Table of Elements Explained - Metals, Nonmetals, Valence Electrons, Charges

    Periodic Table of Elements Explained - Metals, Nonmetals, Valence Electrons, Charges

    29
  2. Protons Neutrons Electrons Isotopes - Average Mass Number & Atomic Structure - Atoms vs Ions

    Protons Neutrons Electrons Isotopes - Average Mass Number & Atomic Structure - Atoms vs Ions

    18