A) 14 elements in the sixth period (atomic no. = 90 to 103) that are filling 4f sub-level
B) 14 elements in the seventh period (atomic no. = 90 to 103) that are filling 5f sub-level
C) 14 elements in the sixth period (atomic no. = 58 to 71) that are filling 4f sub-level
D) 14 elements in the seventh period (atomic no. = 58 to 71) that are filling 4f sub-level
Correct Answer: C
Solution :
Lanthanides are the 14 elements of IIIB group and sixth period (At. no. = 58 to 71) that are filling 4\[f\] sub-shell of antipenultimate shell from 1 to 14. Actually, they are placed below the periodic table in horizontal row as lanthanide series.
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