Question

Among the following which has highest ionization energy?

• A. $C$
• B. $N$
• C. $O$
• D. $F$
• E. $Ne$

Answer 1

Answer: (E)

$Ne$

Noble Gases have a very stable electronic configuration, therefore, they have the highest amount of ionization energy within their periods. It decreases down a group because electrons farther from the nucleus are easier to remove.

Largest to Smallest: Helium (highest ionization level in the periodic table)

In these options only $Ne$ is a noble gas, so it has the highest ionization energy among them.

Hence, option E is correct.