Answer the following question given this paragraph: 

The classes of elements are metals, metalloids, and nonmetals. They are color-coded in the table. Blue stands for metals, orange for metalloids, and green for nonmetals. You can read about each of these three classes of elements later in the chapter, in the lesson "Classes of Elements. ".


Q: Metals, metalloids, and nonmetals are the different classes of what?

 Choices:

- compounds

- structures

- ions

- elements

A:
elements
