What is the effective nuclear charge at the periphery of nitrogen atom when an extra electron is added in the formation of an anion.Compare this value when the atom is ionised.
1for N- anion .........
no of electrons in valence shell= 6
sheilding constant for 2p orbital = .35 x 5 + .85 x2 = 3.45
derefore z (eff) = 7- 3.45 = 3.55
for N + cation
no of electrons in valence shell = 4
sheilding constant = .35 x3 + .85 x2 =2.75
derefor z( eff) = 7 - 2.75 = 4.25
1for N + cation
electron in the outermost orbit is screened by 4 electrons in nth orbit and 2 electrons in (n-1)th orbit.
no of electrons in valence shell = 4
sheilding constant = .35 x4 + .85 x2 =3.10
derefor z( eff) = 7 - 3.10 = 3.90