List four common ions with a valence electron configuration of [Kr]. List the ions in the order of increasing atomic number. Hint: two anions and two cations.

Explanation:

       Se < Br < Rb < Sr

       Se (Z) = 34

       Br (Z) = 35

       Rb (Z) = 37

       Sr (Z) = 38

         Se (Z) = [Ar]

         Br (Z) = [Ar]

         Rb (Z) = [Kr]

         Sr (Z) = [Kr]

Therefore, the respective ions formed according to theabove electronic configuration are

Hence the two anions are

and, the two cations are

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