Q. 165.0( 2 Votes )

Which amongst the

Answer :

We will first write the electronic configuration of all the elements mentioned:

17:- 2,8,7

10:- 2,8

20:- 2,8,8,2

12:- 2,8,2

19:- 2,8,8,1

15:-2,8,5

So, the elements with atomic number

17, 12, 15 belong to the same period as they have the same number of the shell.

20, 19 belong to the same period as they have the same number of the shell.

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