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Question

Calculate the effective nuclear charge at the periphery of nitrogen atom when an extra electron is added in the formation of anion. Also calculate the effective nuclear change of N atom.

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Solution

For nitrogen,
Electronic configuration 1s22s22p3
Screening constant σ=(0.35×4)+(0.85×2)=3.10
Effective nuclear charge Z=Zσ=73.10=3.90
For N
Electronic configuration 1s22s22p4σ=(0.35×5)+(0.85×2)=3.45
Z=zσ=73.45=3.55

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