Q.

The element having the highest first ionization enthalpy is                  [2024]

1 C  
2 Al  
3 Si  
4 N  

Ans.

(4)

IE1 of Carbon-1086kJmol-1

IE1 of Al-577kJmol-1

IE1 of Si-786kJmol-1

IE1 of N-1402kJmol-1