Q.

Which orbital is filled immediately before the 4f subshell?

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a

6s

b

5p

c

5d

d

4d

answer is C.

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Detailed Solution

One e−goes to 5d sub-shell before the 4f sub-shell  The electronic configuration of La(Z=57)⇒[Xe]546s25d14f0Ce(Z=58)⇒[Xe]546s25d14f1
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Which orbital is filled immediately before the 4f subshell?