9702 · 11.1
Atoms, nuclei and radiation
Welcome to the incredible world of **Atoms, Nuclei and Radiation**! This topic delves into the very core of matter, exploring the tiny particles that make up everything around us. From the groundbreaking **Rutherford scattering experiment** to the strange realm of **quarks** and **radioactive decay**, you'll unlock the secrets of how atoms are built and how they transform. Get ready to explore the fundamental forces shaping our universe! This pilot aligns with **Senpai Corner** AS notes (2025–2027) for topic **11.1**.
Need to know
What you need to know
- α-particle scattering provided the proof of the structure of the atom.
- When α-particles are fired at thin gold foil, most of them go straight through but a small number bounce straight back.
- Atoms of all elements are made up of three types of particles: protons, neutrons, and electrons.
- The proton number (Z) is the number of protons in an atom, defining the element.
- Almost all the mass of an atom is concentrated in the nucleus, which is held together by the strong nuclear force.
Explanation
Atoms, nuclei and radiation
- α-particle scattering provided the proof of the structure of the atom.
- When α-particles are fired at thin gold foil, most of them go straight through but a small number bounce straight back.
- Atoms of all elements are made up of three types of particles: protons, neutrons, and electrons.
- The proton number (Z) is the number of protons in an atom, defining the element.