Which of the following isoelectronic species has the largest radius?

  1. A

    K+

  2. B

    Ca2+

  3. C

    P3

  4. D

    S2

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    Solution:

    Atomic radius decreases as we move from left to right in a period and it increases when we go down a group.

    They all are isoelectronic they all contain the same no. of electrons 

    for isoelectronic ion ionic radii α1No. of protons 

    Therefore, isoelectronic species has the largest radius is 

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