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The electronic configuration of \( \mathrm{Cu} \) (atomic number 29) is
(a) \( 1 s^{2}, 2 s^{2} 2 p^{6}, 3 s^{2} 3 p^{6}, 4 s^{2} 3 d^{9} \)
(b) \( 1 s^{2}, 2 s^{2} 2 p^{6}, 3 s^{2} 3 p^{6} 3 d^{10}, 4 s^{1} \)
(c) \( 1 s^{2}, 2 s^{2} 2 p^{6}, 3 p^{2} 3 p^{6}, 4 s^{2} 4 p^{6}, 5 s^{2} 5 p^{1} \)
(d) \( 1 s^{2}, 2 s^{2} 2 p^{6}, 3 p^{2} 3 p^{6}, 4 s^{2} 4 p^{6} 3 d^{3} \)
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