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  4. A 3d-electron having spin quantum number, s=+(1/2), can have a magnetic quantum number:

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Q. A 3d-electron having spin quantum number, $ s=+\frac{1}{2}, $ can have a magnetic quantum number:

JIPMERJIPMER 1996

Solution:

For d-sub-shell, the value of azimuthal quantum number $ (l)=2. $ $ \therefore $ Total number of values of $ m=(2l+1)=5 $ These five values of m are -2, -1, 0, +1 and +2. Hence, 3d-electron can have -2 magnetic quantum number. (-3 and +3 values are possible only for f-orbitals)