14 elements in the sixth period (atomic no. = 90 to 103) that are filling $4f$ sub level.

14 elements in the seventh period (atomic no. = 90 to 103) that are filling $5f\;$ sub level.

14 elements in the seventh period (atomic no. = 58 to 71) that are filling $4f$ sub-level.

NEET UG CHEMISTRY MCQ: d & f- BLOCK ELEMENTS

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Lanthanides are

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Correct option: C

14 elements in the sixth period (atomic no. = 58 to 71) that are filling

4f

sub-level.

Option C (14 elements in the sixth period (atomic no. = 58 to 71) that are filling

4f

sub-level) is correct because lanthanides are defined as the 14 elements following lanthanum in the sixth period, filling the 4f sub-level.

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