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Question
Write down the number of 3d electrons in the following ion:
Co2+
Indicate how would you expect the five 3d orbitals to be occupied for this hydrated ions (octahedral).
Very Short Answer
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Solution 1
| Metal ion | Number of d-electrons | Filling of d-orbitals |
| Co2+ | 7 | \[\ce{t^5_{2g}e^2_g}\] |
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Solution 2
Co2+: 3d7
Filling of orbitals in octahedral hydrated ion:
Co2+: \[\ce{t^5_{2g}e^2_g}\]
| ↑ | ↑ | eg | |
| ↑↓ | ↑↓ | ↑ | t2g |
(3 unpaired electrons)
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Chapter 4: The d-block and f-block Elements - Exercises [Page 117]
