Based on the number of electrons in its outer shell or highest energy level,which of these atoms is most stable?

Question

Quizplus · Accepted Answer

Neon with atomic number 10 has a completely filled outer shell, which makes it the most stable among the given atoms. It has 8 electrons in its outer shell, which is the maximum number of electrons that can be accommodated in that shell according to the octet rule. Hydrogen has only 1 electron in its outer shell, which makes it highly reactive, while carbon, oxygen, and magnesium have partially filled outer shells and can readily form chemical bonds to achieve a stable configuration.

Based on the Number of Electrons in Its Outer Shell