Which of the following pnictogens (N, P, or As) has the atomic radius?  This chalcogen has the smallest atomic radius because, compared to the other chalcogens, it has___  number of electron shells and___  effective nuclear charge. Which of the following third-period elements (Na, Si, or S) has the smallest atomic radius?  This third-period element has the smallest atomic radius because, compared to the other third-period elements, it has___  number of electron shells and___  effective nuclear charge. options to pick from:  - the largest, the smallest, about the same

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