# If electron has spin quantum number +1/2 and a magnetic quantum number - 1, it cannot be present in

1. A

d-orbital

2. B

f-orbital

3. C

p-orbital

4. D

s-orbital

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### Solution:

As m = (2l + 1), hence m = - 1 means,
$-1=2\mathrm{\ell }+1.\mathrm{\ell }=1$ (magnitude)
i.e least value of l = l. So it cannot be present in s-orbital. Because for s orbital l = 0.

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