Which of the following species must have maximum number of electrons in ' \( \mathrm{d} \) ' orb....

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Which of the following species must have
\( \mathrm{P} \)
maximum number of electrons in ' \( \mathrm{d} \) ' orbital?
(1) \( \mathrm{Cr} \)
(2) \( \mathrm{Fe}^{3+} \)
(3) \( \mathrm{Cu} \)
(4) Both (1) and (2)


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