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As you move down a group, the number of valence shells increase. More valence shells result in a higher shielding effect. Thus, the valence electrons feel a weaker pull from the nucleus, and they are able to more easily dissociate. This results in a stronger acid, as stronger acids dissociate more easier/completely.
Acid strength is based on how easily an atom can dissociate its electrons, as you go down a group there is more valence rings which allow for easier dissociation because the valence shell is farther away from the protons.
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