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Gadolinium belongs to \( 4 f \) series. It's atomic number is 64 . Which of the following is the correct electronic configuration of gadolinium?
\( \mathrm{P} \)
(i) \( [\mathrm{Xe}] 4 f^{7} 5 d^{1} 6 s^{2} \)
\( \mathrm{W} \)
(ii) \( [\mathrm{Xe}] 4 f^{6} 5 d^{2} 6 s^{2} \)
(iii) \( \quad[\mathrm{Xe}] 4 f^{8} 6 d^{2} \)
(iv) \( [\mathrm{Xe}] 4 f^{9} 5 s^{1} \)
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