Question

compounds are considered pure substances, but are made of only one type of element. many types of elements and compounds. at least two types of elements bonded together

Explanation:

To determine the correct answer, we recall the definition of a compound. A compound is a pure substance composed of two or more different elements chemically bonded together.

• The first option ("only one type of element") describes an element, not a compound.
• The second option ("many types of elements and compounds") describes a mixture, not a pure substance like a compound.
• The third option ("at least two types of elements bonded together") matches the definition of a compound.

Answer:

The correct option is the one with the statement "at least two types of elements bonded together" (the third option, though the identifier for the checkbox isn't labeled, but based on the content, the correct choice is the option stating "at least two types of elements bonded together").