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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