# How many electrons in the same atom can share the quantum number n = 2?

2

6

8

10

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thankins2017p7070cWith the principle quantum number being 2, the maximum number that can share this is 8. You can use the general formula 2n^2 to calculate this number (n=quantum level), or you can use the concept of quantum numbers (n, l, m, s) to justify this answer.