Which pair has elements containing same number of electrons in the outermost orbit? (A) \( \math...
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Which pair has elements containing same number of electrons in the outermost orbit?
(A) \( \mathrm{N}, \mathrm{O} \)
(B) \( \mathrm{Na}, \mathrm{Ca} \)
(C) As, \( B i \)
(D) \( \mathrm{Pb}, \mathrm{Sb} \)
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