Atomic Number, The identity of the atom, Atomic Mass, Contains neutrons and protons, Neutrons, 1 amu neutral charge, Protons, 1 amu positive charge, Electrons, 0 amu orbits the nucleus, Protons, Give the Atoms it's identity, Valence Electrons, cause reactivity, Group 1 and Group 17, Both Highly reactive, Group 18, Inert or nonreactive, Periods, Energy levels, Halogens, Group 17, Alkali Earth Metals, Groups 2, Alkali Metals, Group 1, Noble Gases, Group 18

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