Q.

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.
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