Which electronic configuration must represent an atom in an excited state?
(a) \( 1 s^{2}, 2 s^{...
Which electronic configuration must represent an atom in an excited state?
(a) \( 1 s^{2}, 2 s^{2} 2 p^{1} \)
(b) \( 1 s^{2}, 2 s^{2} 2 p^{2} \)
(c) \( 1 s^{2}, 2 s^{2} 2 p^{2}, 3 s^{1} \)
(d) \( 1 s^{2}, 2 s^{2} 2 p^{5} \)
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