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.

Answer 1

For nitrogen,

Electronic configuration $1s^{2}2s^{2}2p^3$

Screening constant $\sigma =(0.35\times 4)+(0.85\times 2)=3.10$

Effective nuclear charge $Z^{\ast }=Z-\sigma =7-3.10=3.90$

For $N^{-}$

Electronic configuration $1s^{2}2s^{2}2p^4\sigma =(0.35\times 5)+(0.85\times 2)=3.45$

$Z^{\ast }=z-\sigma =7-3.45=3.55$