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Gadolinium belongs to \( 4 f \) series. Its atomic number is 64. Which of the following is the correct electronic configuration of gadolinium?
(A) \( [\mathrm{Xe}] 4 f^{7} 5 d^{1} 6 s^{2} \)
(B) \( [\mathrm{Xe}] 4 f^{6} 5 d^{2} 6 s^{2} \)
(C) \( [\mathrm{Xe}] 4 f^{8} 6 s^{2} \)
(D) \( [\mathrm{Xe}] 4 f^{9} 5 s^{1} \)
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