Which one of the following order is correct for the first ionization energies of the elements? — Periodic Table and Periodicity Chemistry Question

💡 Solution & Explanation

Ionization energy is the amount of energy required to remove an electron from an isolated neutral gaseous atom. Ionization energy increases from left to right in periods and it decreases down the group. But the ionization enthalpy of nitrogen is more than oxygen due to the stability of half-filled p-orbitals and the PERIODIC PROPERTIES 40 ionization enthalpy of boron is less than beryllium due to the presence of loosely bond 2p electron. Therefore, the correct order is B < Be < O < N .