Question

which is a substance that is made up of only one type of atom?
○ compound
○ element
○ solution
○ mixture

Explanation:

To solve this, we analyze each option:

• A compound is made of two or more different atoms bonded together.
• An element is defined as a substance composed of only one type of atom.
• A solution is a homogeneous mixture of substances.
• A mixture is a combination of two or more substances (elements or compounds) that are not chemically bonded.

So the substance made of only one type of atom is an element.

Answer:

B. element (assuming the options are labeled as A. compound, B. element, C. solution, D. mixture)