Which electronic configuration is not observing the (n + l) rule ?
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a
1s2, 2s22p6, 3s23p63d1, 4s2
b
1s2, 2s22p6, 3s23p63d7, 4s2
c
1s2, 2s22p6, 3s23p63d5, 4s1
d
1s2, 2s22p6, 3s23p63d8, 4s2
answer is C.
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Detailed Solution
3d subshell filled with 5 electrons (half-filled) is more stable than that filled with 4 electrons. Hence one, 4s electrons jump into 3d subshell for more stability.