Which of the following best explains the relationship between molecules and atoms?

• A. Atoms can only exist as part of a molecule.
• B. Molecules and atoms are identical in structure and properties.
• C. Atoms are formed by combining multiple molecules.
• D. Molecules are composed of two or more atoms chemically bonded together.

Answer: (D)

Verified step by step guidance

1. Understand the basic definitions: An atom is the smallest unit of an element that retains the chemical properties of that element, while a molecule is a group of two or more atoms bonded together.
2. Recognize that atoms can exist independently (like noble gases) or can bond with other atoms to form molecules.
3. Note that molecules are formed when atoms chemically bond, meaning they share or transfer electrons to achieve stability.
4. Realize that molecules are not identical to atoms; molecules have different properties depending on the types and arrangements of atoms within them.
5. Conclude that the correct relationship is that molecules are composed of two or more atoms chemically bonded together.