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Which one of the following pairs of atom...

Which one 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

Text Solution

Verified by Experts

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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