Class 12 NEET Chemistry D And F Block Elements Questions

Question : 71 of 110

Marks: +1, -0

Lanthanoids are

(2004)

14 elements in the sixth period (atomic no. 90 to 103 ) that are filling 4f sublevel
14 elements in the seventh period (atomic number =90 to 103 ) that are filling 5f sublevel
14 elements in the sixth period (atomic number =58 to 71 ) that are filling the 4f sublevel
14 elements in the seventh period (atomic number =50 to 71 ) that are filling 4f sublevel.

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