Cl- has completely filled K & L shells. Explain.

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Solution

Atomic number of chlorine is 17
So the configuration is 2,8,7
The first electron shell can hold upto two electrons. The second shell and third can hold up-to eight electrons. Since it has 7 valance electrons, the last number is 7. Therefore the electronic configuration is 2,8,7. So it has completely filled K and L shell

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