Alkali Metal: Group 1, potassium, 1 valence electron, most reactive metal, lose 1 electron, Alkaline-Earth Metal: Group 2, calcium, 2 valence electrons, lose 2 electrons, Halogen: Group 17, fluorine, 7 valence electrons, most reactive non-metal, gain 1 electron, Noble Gas: Group 18, neon, 8 valence electrons, chemically unreactive (stable),

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