Question

How does the reactivity of the elements change as you go down the periodic table
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Answer 1

The metallic character increases as you go down a group. Since the ionization energy decreases going down a group, the increased ability for metals lower in a group to lose electrons makes them more reactive.

Answer 2

The farther to the left and down the periodic chart you go, the easier it is for electrons to be given or taken away, resulting in higher reactivity