Within  a group of elements, as the atomic number increases, the atomic radius does what. (ie: increase, decrease, remains the same)???    

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As you go down any group in the periodic table, you are adding an additional  energy level containing electrons so the atomic radius increases down the group.

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atyourservice | Student

Within  a group of elements, as the atomic number increases, the atomic radius increases because you are adding new valance shells at each level.

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senioreeto | Student
the atomic radius decreases down a group becoz as we go from top to bottom in a group,one new valence shell gets added in the atom which increases its radius.

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