Final answer:
Fluorine and iodine are both halogens in Group 7A of the periodic table, with seven valence electrons, which explains their similar chemical properties.
Step-by-step explanation:
Elements that are in the same group on the periodic table have similar chemical properties because they have the same number of valence electrons. Valence electrons are important because they are the ones involved in chemical reactions, either through the loss, gain, or sharing of these electrons.
When comparing the options A) Boron and iodine B) Nitrogen and boron C) Fluorine and nitrogen D) Fluorine and iodine, we can conclude that Fluorine (F) and iodine (I) both belong to the same group of elements, known as halogens. Halogens are found in Group 7A of the periodic table and are characterized by having seven valence electrons which define their similar reactivities and properties.