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The maximum number of electrons can have...

The maximum number of electrons 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
For proincipal quantum number `( n= 3)`
Number fo obital `s= n^2 =9`
So, number of elecrons with ` m_s =- 1/2` will be 9.
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