Which of the following statement(s) is/are TRUE regarding the anomalous trends in ionization enthalp — Periodic Table and Periodicity Chemistry Question

💡 Solution & Explanation

Statement A is true: $O^+$ has a stable $2p^3$ half-filled configuration, making $IE_2$ higher than $F^+$ ($2p^4$). Statement B is true: removing a 3rd electron from P is harder than from Al due to a higher $Z_{eff}$. Statement C is false: $Ga$ has a slightly higher $IE_1$ than $Al$ due to poor $3d$ shielding. Statement D is true: $Cu^+$ is $3d^{10}$ (stable full subshell), making $IE_2$ extremely high compared to $Zn^+$ ($4s^1$).