Ionization energy is

Question

Quizplus · Accepted Answer

Ionization energy is the amount of energy needed to remove an electron from the outermost energy level of an atom or ion. Option A is incorrect because ions already have gained or lost electrons, so they cannot acquire energy from them. Option B is incorrect because potassium has a lower ionization energy than lithium due to the additional electron shell, which shields the outermost electron from the positively charged nucleus. Option C is incorrect because ionization energy decreases down Group 1A as the atomic radius increases, making it easier to remove the outermost electron. Option E is incorrect because fluorine has a higher ionization energy than chlorine due to its smaller atomic radius and stronger nuclear charge.

Ionization Energy Is