Which atom has the largest atomic radius?

  1. A

    Li 

  2. B

     K 

  3. C

    AB 

  4. D

    Br

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    Solution:

    The fourth electron shell has a bigger radius than the third because it is situated farther from the nucleus. So, compared to the simple cation, the uncharged potassium atom will have a larger atomic radius. Hence, the option B is correct.

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