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NCERT Class XI Chemistry Structure of Atom Solutions

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Question : 67 of 67
Marks: +1, -0
(a) How many sub-shells are associated with n = 4?
(b) How many electrons will be present in the sub-shells having ms value of –1/2 for n = 4?
Solution:  
(a) n = 4, l = 0, 1, 2, 3 [Since l = 0 to n – 1]
∴ Number of sub-shells = 4
(b) Number of electrons having msm_s = –1/2 = 322\frac{32}{2} = 16
[Since Maximum number of electrons = 2n22n^2 = 2 × 424^2 = 32]
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