Question

The maximum sum of (n+l+m) values for unpaired electrons in the excited state of sulphur where it shows maximum covalency is:

A
28
B
25
C
20
D
27

Solution

The correct option is A 28Electronic configuration of sulphur (atomic no. = 16) at the ground state: =[Ne] 3s2 3p4 excited state: =[Ne] 3s1 3p3 3d2 S has 6 unpaired electrons in its excited state where it has maximum covalency. For 3s1, n=3,  l=0,  m=0 ∴n+l+m=3 For 3p3, n=3,  l=1,  m=+1,0,−1 ∴n+l+m=(3+1+1)+(3+1+0)+(3+1−1) =12 For  3d2, n=3,  l=2,  m=+2,+1 ∴n+l+m=(3+2+2)+(3+2+1) =13 Total value becomes =3+12+13=28Co-Curriculars

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