Exclusion Principle: The only valid electron state and shell designation among the following is
A. 1p, K (n = 1) shell.
B. 2s, K (n = 1) shell.
C. 1s, L (n = 2) shell.
D. 2p, L (n = 2) shell.
E. 3f, M (n = 3) shell.
Answer: D
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