Question:

The elements with atomic numbers 101 and 104 belong to, respectively:

  1. Group 11 and Group 4

  2. Actinoids and Group 6

  3. Actinoids and Group 4

  4. Group 6 and Actinoids


Correct Option: , 3

Solution:

${ }_{89} \mathrm{AC} \longrightarrow{ }_{103} \mathrm{Lr}$

Belongs to actinoids series and they all belongs to $3^{\mathrm{rd}}$ group. So atomic no. 101 element is actinoids and atomic number 104 element belongs to $4^{\text {th }}$ group.

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