what-is-the-best-explanation-for-the-fact-that-the-ionization-energy-of-boron-is-1

Question

Why does boron have a lower ionization energy than beryllium?

Accepted Answer

The filled s subshell of beryllium is more stable.

Answer

Electrons in the subshells of beryllium experience more repulsions.

Answer

Beryllium has a smaller effective nuclear charge (Zeff) than boron.

Answer

Boron has a smaller atomic radius which makes it easier to remove a valence electron.