If an electron has spin quantum number of $+ 1 / 2$ and magnetic quantum number of $- 1$ , it cannot be present in:

s -

orbital

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p -

orbital

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d -

orbital

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f -

orbital

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Solution

The correct option is A $s -$ orbital
n and l must be a positive integer
l < n
l = 0, ......., (n-1)
m is an integer existing from -l to +l

spin quantum $= \pm 1 / 2$

If we take s orbital l = 0 then m = 0.in question m = -1 which is not possible

Hence it is s-orbital.

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