Group 1: Alkali metals, react rapidly with water and violently with acid, become more reactive as you go down the group, release hydrogen gas when they react with water, Lithium is an example, Group 7: Halogens, exist as diatomic molecules, chlorine is an example, become less reactive as you go down the group, can be a gas, liquid or solid, Group 0: Noble gases, very unreactive, all of them are gases, Neon is an example, exist as monatomic atoms,

group 1,7,0

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