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The electronic configurations of Eu (Atomic No. 63) Gd (Atomic No. 64) and Tb (Atomic No. 65) are:
(a) \( [\mathrm{Xe}] 4 f^{7} 6 s^{2},[\mathrm{Xe}] 4 f^{7} 5 d^{1} 6 s^{2} \) and \( [\mathrm{Xe}] 4 f^{9} 6 s^{2} \)
(NEET 2016)
(b) \( [\mathrm{Xe}] 4 f^{7} 6 s^{2},[\mathrm{Xe}] 4 f^{8} 6 s^{2} \) and \( [\mathrm{Xe}] 4 f^{8} 5 d^{1} 6 s^{2} \)
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(c) [Xe]4 \( 4 f^{6} 5 d^{1} 6 s^{2} \), [Xe] \( 4 f^{7} 5 d^{1} 6 s^{2} \) and \( [\mathrm{Xe}] 4 f^{9} 5 d^{1} 6 s^{2} \)
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(d) \( [\mathrm{Xe}] 4 f^{6} 5 d^{1} 6 s^{2} \), [Xe] \( 4 f^{7} 5 d^{1} 6 s^{2} \) and \( [\mathrm{Xe}] 4 f^{8} 5 d^{1} 6 s^{2} \)
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