The numbers listed represent the number of electrons in the first, second, and third energy levels, respectively. On this basis, which of the following is an unstable or reactive atom?

Question

Quizplus · Accepted Answer

An atom with one electron in its outermost energy level (also known as valence electron) is considered unstable or reactive. Option A has one electron in the third energy level, making it an unstable or reactive atom.

The Numbers Listed Represent the Number of Electrons in the First