🔍 Key Concepts

• Basic atomic structure: protons, neutrons, and electrons • Difference between particles and units of measurement (like joules) • Meaning of ion as compared to a fundamental particle

💭 Think About

• Which option names a fundamental particle that actually carries a negative electrical charge? • Are any of these terms units used to measure something (like energy or magnetism) rather than pieces of matter? • What does the term for a charged atom or molecule mean, and does that match “smallest known unit of negative electrical charge”?

✅ Before You Answer

• Identify which choice is the fundamental particle of the atom. • Eliminate any option that is a unit of measurement, not a piece of matter. • Check which term correctly matches negative electrical charge in basic physics/chemistry.