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 an incomplete outermost energy level is considered unstable or reactive. In this case, option B has only one electron in its outermost energy level, making it more likely to react with other atoms to either gain or lose electrons to complete its outermost energy level.

The Numbers Listed Represent the Number of Electrons in the First