Which term describes a group of atoms joined together in a particular way?

• A. Energy
• B. Change
• C. Stability
• D. Molecule

Answer: (D)

A molecule is a group of atoms bonded together in a specific arrangement, forming a distinct unit with its own properties. This bonding gives the molecule its shape and behavior, as seen in water (two hydrogen atoms and one oxygen atom) or oxygen gas (two oxygen atoms). Energy, change, and stability describe different ideas: energy is the capacity to do work, change is a process, and stability is about how likely a system is to remain the same. They don’t name a group of atoms joined together, so the correct concept is molecule.