Foreach of the followingpairspredictwhich one haslowerfirstionization enthalpy ? (i) N or O (ii) Na or Na^(+)(iii) Ba^(+)"or" Mg^(2+)(iv)" or" I^(-)

Foreach of the followingpairspredictwhich one haslowerfirstionization

1.	Foreach of the followingpairspredictwhich one haslowerfirstionization enthalpy ? (i) N or O (ii) Na or Na^(+)(iii) Ba^(+)"or" Mg^(2+)(iv)" or" I^(-)
Answer» SOLUTION :(i) O haslower `Delta_(i) H_(1)` thanN becausein caseof O ,loss of an electrongives `O^(+)` whichhas stableexactlyhalf- filledelectronic configurationwhile INCASE of N, anelectronhas to thetobe lostfroma stablehalf- filledelectronic configuration (ii)Na haslower `Delta_(i) H_(1)` than `Na^(+)` becauseof the followingtwo reasons : (a)In caseof `Na^(+)`an electron hasto belostfrom astableinert gasconfigurationbut incase ofNa , lossof anelectrongivesstableinertgasconfiguration(B) Na is neutralbut `Na^(+)` is + vely charged (III) `Be^(+)` haslower`Delta_(i)H_1)` than `Mg^(2+)` becausein caseof `Be^(+)` the lossof oneelectrongivesa stableinertgasconfigurationbut in caseof `Mg^(2+)` the electron has to belost fromthe stable INERTGAS configuration . (iv)I haslower `Delta_(i) H_(1)` than `I^(-)` becausein caseof `I^(-)` an electronhas to belostfroma stableinertgas configuration