निम्न में से किसके \( +3 \) आयन में अर्द्ध-पूरित \( 4 f \)-उपकोश होगी?
(A) \( \mathrm{La}^{3+} \...
निम्न में से किसके \( +3 \) आयन में अर्द्ध-पूरित \( 4 f \)-उपकोश होगी?
(A) \( \mathrm{La}^{3+} \)
(B) \( \mathrm{Lu}^{3+} \)
(C) \( \mathrm{Cu}^{3+} \)
(D) \( \mathrm{Gd}^{3+} \)
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