Which of the following pairs of atoms have same number of electrons in the outermost orbit?

N - O

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N a - C l

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C a - C l

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C l - B r

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Solution

The correct option is B $C l - B r$
$C l - B r$ belongs to same group( $7$ thA group),hence they contain same outer electronic configaration i.e $n s^{2}$ $n p^{5}$ so they contains same $7$ number of electrons $(2 + 5)$

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