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Which of the following pairs has elements
containing same number of electrons in the
outermost orbit?

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N,O

Na, Cl

Ca, Cl

Cl, Br

answer is D.

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Detailed Solution

Cl-Br belongs to same group(7thA group),hence they contain same outer electronic configuration i.e n s² n p⁵ so they contains same 7 number of electrons(2+5)

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