Why is the atomic radii so high on the left side of the periodic table?

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according worksheet given me, element #'s 3, 11, 19, , 37 have of highest atomic radii , happened notice elements have 1 valence. can tell me why have such high atomic radii? know atomic number increases on each period, radii becomes less , less , shoots once hits first element on next row. want tell me why radii high @ first valence?

according worksheet given me, element #'s 3, 11, 19, , 37 have of highest atomic radii , happened notice elements have 1 valence. can tell me why have such high atomic radii? know atomic number increases on each period, the...


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