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Nuetrik [128]
4 years ago
10

List four common ions with a valence electron configuration of [Kr]. List the ions in the order of increasing atomic number. Hin

t: two anions and two cations.
Chemistry
1 answer:
chubhunter [2.5K]4 years ago
6 0
<h2> Se^{-2}, Br^{-}, Rb^{+}, Sr^{+2}.</h2>

Explanation:

  • Atomic number of krypton [Kr] =36
  • Electronic configuration of krypton [Kr] = [Ar]3d^{10} 4p^{6}, 2s^{2}
  • Common ions with valence electronic configuration of [Kr] are bromine ion, strontium ion, selenite ion and rubidium ion.
  • The Atomic number of the following ions in increasing order are;

       Se < Br < Rb < Sr

       Se (Z) = 34

       Br (Z) = 35

       Rb (Z) = 37

       Sr (Z) = 38

  • Electronic configuration of the following elements are:

         Se (Z) = [Ar](3d^{10}, 4s^{2}, 5p^{4})

         Br (Z) = [Ar](3d^{10}, 4s^{2}, 5p^{5})

         Rb (Z) = [Kr](5s^{1})

         Sr (Z) = [Kr](5s^{2})

Therefore, the respective ions formed according to theabove electronic configuration are Se^{-2}, Br^{-}, Rb^{+}, Sr^{+2}

Hence the two anions areSe^{-2}, Br{-}

and, the two cations areRb^{+}, Sr{+2}

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