Question

Why is ionization enthalpy of Beryllium higher than Boron.

Answer 1

The first ionization of Beryllium is greater than that of Boron because Beryllium has a stable complete electronic configuration $\left(1s^{2}2s^2\right)$ so it, require more energy to remove the first electron from it, where as Boron has electronic configuration $\left(1s^{2}2s^{2}3s^1\right)$ which need lesser energy than that of Beryllium.