Lanthanides are the group of elements in which the differentiating electron enters into:

s -

sub level

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d -

sub level

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p -

sub level

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f -

sub level

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Solution

The correct option is D $f -$ sub level
In Lanthanids, the last or differentiating electron enters into 4f orbital of the anti-penultimate shell.

The general electronic configuration of Lanthanides is $[X e] 4 f^{1 - 14} 5 d^{1} 6 s^{2}$ .

Hence, option D is correct.

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