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Question

[CoF6]3 is a coordination complex ion.
How many unpaired electrons are there in the complex?

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Solution

In the complex [CoF6]3, the oxidation number of Co is +3. The outer electronic configuration of Co3+ ion is 3d6. It can also be written as t42ge2g. Thus there are 4 unpaired electrons, 2 in t2g level and 2 in eg level.

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