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If you are asking about the number of electrons then it would be 8. The first shell can hold a maximum number of 2 electrons. The second and third shell would have a maximum of 8 electrons each.

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Q: How many of atoms are in the 3rd shell of an atom with 4 shells?
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Related questions

How many valence shells does an atom has?

The valence shell is the outermost shell...and an atom can only have one outer shell.


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How many atoms with 1 electron in their outer most shells bond with an atom which has 4 electrons in its outer most shell?

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