Which of the following arrangements represents the correct order of electronic energy level?
a
1s 2p 2s 3p 3s 3d 4s
b
1s 2s 2p 3s 3p 3d 4s
c
1s 2s 2p 3s 3p 4s 3d
d
1s 2s 3s 2p 3p 4s 3d
Explanation
Correct Option
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