explain the periodic trend atomic size in group and period
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In general, atomic radius decreases across a period and increases down a group. Across a period, effective nuclear charge increases as electron shielding remains constant. ... Down a group, the number of energy levels (n) increases, so there is a greater distance between the nucleus and the outermost orbital.
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In a group atomic size increases as we move down from top to bottom because of increase of shells but in case of periods as we move from left to right atomic size decreases as nuclear charge only increases but not shells.
Hence Atomic size along a period -decreases.
Down the group - Increases.
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