A) Caesium
B) Fluorine
C) Xenon
D) Nitrogen
Correct Answer: B
Solution :
Key Idea: lonisation energy is the amount of energy required to take out most loosely bonded electron from isolated gaseous atom. Its value increases in a period and decreases in a group. \[\therefore \]Among \[Cs,\,\,F,\,\,Xe\] and \[N\], ionisation energy of \[F\] is highest.
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