The $4 f$ level is successively filled up in:

alkali metals

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rare gases

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lanthanides

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actinides

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Solution

The correct option is C lanthanides
The $4 f$ level is successively filled up in lanthanides as the general configaration of lanthanides is $(n - 2) f^{1 - 14} (n - 1) d^{0 - 1} n s^{0}$ or $1$ or $2$
Hence, the correct option is $C$

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