Why IE2 is greater than IE1?

Answer 1

Ionization energy (IE2) is greater than ionization energy (IE1) because removing a second electron from an atom often requires more energy than removing the first. This is due to increased effective nuclear charge on the remaining electrons after the first electron has been removed, which results in a stronger attraction between the nucleus and the remaining electrons. Additionally, if the first electron is removed from a stable electron configuration, the resulting ion may be more stable, further increasing the energy required for subsequent ionization.