ChemistryThe electronic configuration of chloride ion is:

The electronic configuration of chloride ion is:

  1. A
    2,8,7
  2. B
    2,8,6 
  3. C
    2,8,8
  4. D
    2,8 

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    Solution:

            Chlorine has atomic number 17. It has 7 outermost electrons and its valency is 1. Its configuration is 2,8,7.
            To achieve stability it needs one electron in its outermost shell so on accepting one electron it becomes Chlorine ion.
            So now it has a total electron 18 and the configuration is 2,8,8.
            Hence Correct option is 3.
      
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