The shells begin from the centre and gradually move outwards. So K shell will always have minimum energy. Similarly, the L shell is a little away from the nucleus so it will have higher energy than the K shell. The outermost shell will have maximum energy.
An atom will first fill the lowest energy level so as to attain the state of minimum energy. Gradually, the electrons will fill the higher energy levels. Therefore, electrons will first fill the K shell, then the L shell, M shell, N shell, and so on
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The shells begin from the centre and gradually move outwards. So K shell will always have minimum energy. Similarly, the L shell is a little away from the nucleus so it will have higher energy than the K shell. The outermost shell will have maximum energy.
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