What are the quantum numbers of the fifth electron of Na

The last electron is in third shell, so Principal quantum number will be 3 .

The azimuthal quantum no. Can be 0,1,2, but as it is the first electron in last shell so the second quantum no. Will be 0 .

Since the second quantum no. is 0, so the magnetic quantum no. will also be 0.

The spin quantum no. will be +1/2, by hund's rule.

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it was spontaneous.

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