Alkali Metals: group 1, lithium, potassium, francium, most reactive at bottom, rubidium, Halogens: astatine, iodine, fluorine, most reactive at top, bromine, group 7, Noble Gases: unreactive, krypton, helium, neon, argon, group 8, Transition Metals: nickel, iridium, chromium, manganese, iron, between groups 2 and 3,

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