Answer From LiveWebTutors UK
The most reactive element in group 1 is Caesium because as we come from top to bottom, the size of atom is increased in the parallel with the number of electron, so the strength to held the electron decrease, and we know that all alkali metal have one electron in outer most shell so it can be very easy to remove that electron from Caesium.
So, the coda is as we come from top to bottom the size of atom increase connotate to reactivity of atom increase.
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