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[Co(CN)6]3- has no unpaired electrons and will be in a low-spin configuration.
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[Co(CN)6]3- has four unpaired electrons and will be in a low-spin configuration
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[Co(CN)6]3- has four unpaired electrons and will be in high-spin configuration.
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[Co(CN)6]3- has no unpaired electrons and will be in a high spin configuration.