(B) Across a period from left to right,the atomic radius decreases. This is because the nuclear charge increases as the number of protons increases,wh

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(B) Across a period from left to right,the atomic radius decreases. This is because the nuclear charge increases as the number of protons increases,while the electrons are added to the same principal energy shell. The increased nuclear attraction pulls the electron cloud closer to the nucleus,resulting in a smaller atomic radius.