Question

Given the PES from the previous question, explain why the ionization energy for the valence electrons of $Ne$ is higher than that of $Ar$.

• A. $Ne$ has more protons than $Ar$ which requires more energy to remove the valence electron.
• B. $Ne$ has more nuclear shielding than $Ar$ which requires less energy to remove the valence electron.
• C. $Ar$ had more protons than $Ne$ which requires more energy to remove the valence electron.
• D. $Ar$ had more nuclear shielding than $Ne$ which requires less energy to remove the valence electron.

Answer 1

The correct option is A $Ne$ has more protons than $Ar$ which requires more energy to remove the valence electron.

Neon has high effective nuclear charge than Argon . So it requires more energy to remove valence electrons. So ionisation energy of 'Ne' is greater than that of 'Ar'.