Which of these particles is found in the nucleus of an atom?

## The reasoning Think of an atom like a building: the **nucleus** is the central core (like the foundation), and electrons orbit around it (like people moving around outside). The nucleus contains two particles: - **Protons** — positively charged (+) - **Neutrons** — no charge (neutral) **Electrons** are negatively charged (−) and they orbit *outside* the nucleus in electron shells. They're never *in* the nucleus itself. This is the fundamental structure of every atom. The principle here is **atomic structure** — understanding where each subatomic particle lives. ## Why the wrong options tempt you **A) Electron only** — Tricks you if you forget electrons orbit *outside* the nucleus, not inside it. **B) Proton only** — Makes you overlook neutrons, which are also in the nucleus but often forgotten because they have no charge. **D) Electron and proton** — Sneaky! It correctly includes protons but wrongly puts electrons in the nucleus. ## Quick takeaway **"The nucleus = protons + neutrons; electrons circle outside."** Remember: the nucleus is the heavy center, electrons are the light orbiting particles.