Which of the following statements accurately describes elements?

• A. Elements can be separated into their constituent atoms by physical processes.
• B. Elements always exist as molecules in nature.
• C. Elements are pure substances that cannot be broken down into simpler substances by chemical means.
• D. Elements are composed of two or more types of atoms chemically bonded together.

Answer: (C)

Verified step by step guidance

1. Understand the definition of an element in chemistry: An element is a pure substance consisting of only one type of atom.
2. Recall that elements cannot be broken down into simpler substances by chemical means, which distinguishes them from compounds.
3. Recognize that elements may exist as single atoms or molecules (like O\_2), but this varies and is not a defining characteristic of all elements.
4. Note that elements cannot be separated into constituent atoms by physical processes because they are already the simplest form of matter in terms of chemical identity.
5. Identify that elements are not composed of two or more types of atoms chemically bonded together; that description fits compounds, not elements.