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Which will be the most stable among $Cu^{+},Fe^+,Fe^{2+}$ and $Fe^{3+}$


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$Fe^{3+}$ has $3d^5$ configuration (i.e) a half filled one and thus more stable.$Cu^+$ no doubt has $3d^{10}$ configuration but less stable because nuclear charge (29 protons) in Cu is not sufficient enough to hold a core of 18 electrons.
Hence (d) is the correct answer.
answered Jan 10, 2014 by sreemathi.v

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