A) carbon
B) boron
C) oxygen
D) nitrogen
Correct Answer: D
Solution :
Key Idea: lonisation potential is amount of energy required to take out most loosely bonded electron from isolated gaseous atom. Its value increases in a period. Element having stable configuration have exceptionally high ionization potential. \[\therefore \] N has highest ionisation potential among C, B, 0 and N (\[\because \] N has \[2{{p}^{3}}\] stable configuration)
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