Which term describes a pure substance that is made up of only one type of atom?

• A. Molecule
• B. Compound
• C. Element
• D. Mixture

Answer: (C)

Verified step by step guidance

1. Understand the definitions of the terms given: A molecule is two or more atoms bonded together, which can be the same or different types of atoms.
2. A compound is a pure substance made up of two or more different types of atoms chemically bonded together.
3. An element is a pure substance that consists of only one type of atom, meaning all atoms have the same atomic number.
4. A mixture is a physical combination of two or more substances that are not chemically bonded and can be separated by physical means.
5. Since the question asks for a pure substance made up of only one type of atom, the correct term is 'Element'.