Free radicals contain unpaired electrons in their outermost energy shell, so they react readily with other atoms or molecules to reach a more stable state. Which of the following could potentially be a free radical?

Question

Quizplus · Accepted Answer

Fluorine (atomic number 9) has seven electrons in its outermost shell, making it one electron short of a full shell. This makes it highly reactive and capable of existing as a free radical by having an unpaired electron in its outer shell. Neon, Magnesium, and Helium have full outer shells, making them stable and unlikely to exist as free radicals.

Free Radicals Contain Unpaired Electrons in Their Outermost Energy Shell