The representative elements are those with unfilled energy levels in which the "last electron" was added to
A) an s orbital.
B) an s or p orbital.
C) a d orbital.
D) a p or d orbital.
E) an f orbital.

Question

Quizplus · Accepted Answer

The representative elements are those in groups 1A through 7A (also known as groups 1 through 17). These elements have unfilled outermost s and p orbitals which are involved in chemical bonding. Therefore, choice B, which includes s and p orbitals, is the best choice.

The Representative Elements Are Those with Unfilled Energy Levels in Which