For which of the following element, all of its existing ion \( \mathrm{M}^{\mathrm{X}+} \) will ...

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For which of the following element, all of its existing ion \( \mathrm{M}^{\mathrm{X}+} \) will be diamagnetic?
(a) \( \mathrm{Cu} \)
(b) \( \mathrm{Fe} \)
(c) \( \mathrm{Cr} \)
(d) \( \mathrm{Na} \)
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