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900 energy shells.fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii

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Wiki User

11y ago
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Wiki User

15y ago

The electron arrangement for Cobalt is 1s22s22p63s23p63d74s2

So, in total there are 7 sub shells used in Cobalt however only 6 filled ones, with 3d7 being the incomplete shell.

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AnswerBot

6mo ago

Cobalt has three energy shells.

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Q: How many energy shells does Cobalt have?
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