Which of the following pairs of atomic numbers represents elements belonging to the same group?

Question

Which of the following pairs of atomic numbers represents elements belonging to the same group? (A) 11 and 20 (B) 12 and 30 (C) 13 and 31 (D) 14 and 33

Tardigrade Admin · Accepted Answer

Element with At. No. 13 is in third period and group 13. The next element below this will have At. No. 13 + 18 = 31

Q. Which of the following pairs of atomic numbers represents elements belonging to the same group?

11 and 20

12 and 30

13 and 31

14 and 33

Element with At. No. 13 is in third period and group 13. The next element below this will have At. No. 13 + 18 = 31