Which of the following pairs of atomic n...

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

A

11 and 20

B

12 and 30

C

13 and 31

D

14 and 33

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The correct Answer is:

C

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

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