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# Which atom has as many as s-electron and p-electrons?

$(a)\;H\qquad(b)\;Mg\qquad(c)\;N\qquad(d)\;Na$

$O(1s^2,2s^22p^4)$ and $Mg(1s^2,2s^22p^6,3s^2)$ only.
Hence (b) is the correct answer.