Which of the following has the greatest magnitude?

Question

Quizplus · Accepted Answer

The third ionization energy of magnesium is the greatest among the options because it involves removing an electron from a positively charged ion (Mg2+) which already has lost two electrons. This process requires significantly more energy than the first ionization of any element or the first electron affinity, due to the increased nuclear charge experienced by the remaining electrons and the decreased shielding effect.

Which of the Following Has the Greatest Magnitude