Which of the following is the correct order of energy levels in an atom?

L,M,K,N

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K,M,N,L

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M,K,N,L

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K,L,M,N

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Solution

The correct option is D
K,L,M,N

The first shell of lowest energy is denoted by n=1 or called K shell.

The second shell is denoted by n=2 or called L shell

The third shell is denoted by n = 3 or called M shell

The fourth shell of highest energy is denoted by n= 4 or N shell.

Thus the correct order is K, L, M and N.

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