The electronic configuration of copper \( \left({ }_{29} \mathrm{Cu}\right) \) is
(1) \( 1 s^{2}, 2 s^{2} 2 p^{6}, 3 s^{2} 3 p^{6} 3 d^{9}, 4 s^{2} \)
(2) \( 1 s^{2}, 2 s^{2} 2 p^{6}, 3 s^{2} 3 p^{6} 3 d^{10}, 4 s^{1} \)
(3) \( 1 s^{2} \cdot 2 s^{2} 2 p^{6}, 3 s^{2} 3 p^{6}, 4 s^{2} 4 p^{6} \)
(4) \( 1 s^{2}, 2 s^{2} 2 p^{6}, 3 s^{2} 3 p^{6} 3 d^{10} \)
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