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first energy level contains only S shell that can accomadate 2 electrons where as 2nd energy level contains S shell and P shell as well which can accomadate 2 and 6(3X2) electrons respectively..so the answer is 8 for 2nd energy level.

(or)

No.of electrons in any main energy level = 2n2

Here n = orbit (or energy level) number

In our question , n = 2

No.of electrons in 2nd energy level = 2(2)2 = 8

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Q: How many electrons can be held in the second energy level of atoms and how can this be determined?
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