Group 1 get MORE reactive as you go DOWN the group because:: The distance of outer shell electrons to nucleus gets LARGER., The attraction of outer shell electrons to nucleus gets LESS., It gets EASIER to LOSE the outer electron., It gets EASIER to form POSITIVE ions., Group 7 get MORE reactive as you go UP the group because:: The distance of outer shell electrons to nucleus gets LESS., The attraction of outer shell electrons to nucleus gets GREATER., It gets EASIER to GAIN ONE electron in the outer shell., It gets EASIER to form NEGATIVE ions.,

Reactivity of Group 1 and Group 7

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