Whichof the followingpairsof elements would you expectto havelowerfirst ionizationenthalpy ? Explain (i)CI or F (ii) CI or S(iii) K or Kr(iv) Kr or Xe

Whichof the followingpairsof elements would you expectto havelowerfirs

1.	Whichof the followingpairsof elements would you expectto havelowerfirst ionizationenthalpy ? Explain (i)CI or F (ii) CI or S(iii) K or Kr(iv) Kr or Xe
Answer» SOLUTION :(i) BECAUSEOF thebigger size thestrongershieldingeffectCI haslower `Delta_(i) H_(1)` than F . (ii)Amongs andCIS haslower `Delta_(i) H_(1)` due tobiggersize andlowernuclearcharge (iii)K haslower `Delta_(i) H_(1)`than Ar hasconfiguration . (iv)Xe becauseof itsbigger sizeand stronger shieldingeffecthas lower `Delta_(i) H_(1)` than Kr.