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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
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B
25
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C
20
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D
27
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Solution

The correct option is A 28
Electronic 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+11)
=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=28

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