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Q.
Which of the following has maximum ionisation energy?
Jharkhand CECEJharkhand CECE 2004
Solution:
Ionisation 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.