Question

Which of the following pairs has elements containing the same number of
electrons in the outermost orbit?
1 N,O
2Na, Cl
3Ca,cl
4 Cl, Br​

Answer 1

Answer:

4=> Cl , Br

Explanation:

Both the elements are of same group that is group 17.

Elements from same group have same number of valence electrons and valency..

Here, the elements have 7 electrons in the outermost orbit.

hope it helps you

Answer 2

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