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26 January, 14:16

How many electrons does the 2nd main energy level hold when it is full?

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  1. 26 January, 14:36
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    8 electrons

    Each principal energy level can contain up to 2n2 electrons, where n is the number of the level. Thus, the first level can contain up to 2 electrons, 2 (12) = 2; the second up to 8 electrons, 2 (22) = 8; the third up to 18, 2 (32) = 18; and so on.
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