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The first shell is just 1S, which can hold 2.

[The second shell is 2S, 2P which can hold 8 total (2+6)

[The third shell is 3S, 3P, 3D which can hold 18 total (2+6+10)

[The fourth shell is 4S, 4P, 4D, 4F which can hold 32 total (2+6+10+14)

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How many electrons can be found in each of the first three energy?

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