Which of the following best describes a molecule?

• A. A group of two or more atoms chemically bonded together
• B. A particle found in the nucleus of an atom
• C. A mixture of different elements not chemically bonded
• D. A single atom with a positive or negative charge

Answer: (A)

Verified step by step guidance

1. Understand the definition of a molecule: A molecule is formed when two or more atoms are chemically bonded together, sharing electrons to create a stable structure.
2. Recognize that a particle found in the nucleus of an atom refers to protons or neutrons, which are subatomic particles, not molecules.
3. Identify that a mixture of different elements not chemically bonded describes a physical mixture, not a molecule, since molecules require chemical bonds.
4. Note that a single atom with a positive or negative charge is called an ion, not a molecule, because it consists of only one atom.
5. Conclude that the best description of a molecule is 'A group of two or more atoms chemically bonded together' because it captures the essential characteristic of molecules.