Question

Why does fluorine have a higher ionization energy than iodine

Answer 1

See below.

Step-by-step explanation:

Because the outer electrons are closer to the nucleus in Fluorine than in Iodine and are more strongly held, so more energy is required to remove these electrons in Fluorine. Also with iodine there are more inner electrons which have a shielding effect on the nuclear attraction forces.

Answer 2

Answer: Fluorine has a stronger "pull" on its electrons

Ionization Energy is a measure of how much energy it takes to "pull" an electron off of an element