Question

Fluorine molecules absorb ______ light and appear ______, whereas iodine molecules absorb ______ light and show ______ colour.

Answer 1

Fluorine molecules absorb violet light and appear yellow, whereas iodine molecules absorb yellow and green light and show violet colour.

Explanation:

The colour of halogens is due to the absorption of visible light, which excites their outer electrons. Fluorine, being small in size, absorbs high-energy violet light and appears yellow (its complementary colour). Iodine, being larger, absorbs low-energy yellow and green light, thus appearing violet.