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Question
What may be the stable oxidation state of the transition element with the following d electron configurations in the ground state of its atom?
3d3
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Solution
The stable oxidation state will be +5 due to the outer electronic configuration 3d3 4s2 (+2, +3, +4, +5).
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Cr | Mn | Fe | Co | Ni | Cu |
| -0.91 | -1.18 | -0.44 | -0.28 | -0.25 | -0.34 |
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| Mn2+/Mn | −1.2 V |
| Fe2+/Fe | −0.4 V |
| Cr3/Cr2+ | −0.4 V |
| Mn3+/Mn2+ | +1.5 V |
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| Metallic radii/pm | 126 | 125 | 125 | 128 |
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| (iii) | \[\ce{M}\] in \[\ce{M(CO)6}\] is | (c) \[\ce{Cu}\] |
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