Why does atomic radius decrease across a period?
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Atomic radius decreases across a period because valence electrons are being added to the same energy level at the same time the nucleus is increasing in protons. The increase in nuclear charge attracts the electrons more strongly, pulling them closer to the nucleus.
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Across period the number of shell are same but atomic number increase due to which attraction between nucleus and outer most electron of atom increases due to this attraction electron came near to nucleus and atom srink so the size of atom decrease.
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