The maximum number of electrons that can...

The maximum number of electrons that can have principal quantum number, n = 3 and spin quantum number `m_s= - 1//2` is ________.

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The correct Answer is:

9

Total number of electrons with (n=3) `=2n^2 =18`
Out of these 18 electrons, 9 electrons will have anticlcokwise spin `(m_s = -1/2)`

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