Chlorine has completely filled KL shells. Explain.

your friend is absolutely correct.
The electron accommodation capacity of energy level is fixed.Like K shell can accommodate 2 electrons and L shell accommodate 8 electrons.So the total number of electron in K+L = 10 . But chlorine atom contain 17 electron which is more than 10 hence K and L shell get completely filled and then their is next shell known as M which occupy the left over 7 electron.The electronic configuration of Cl is 2,8,7.

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