GCSE Physics (9-1) - GCSE Physics - Atomic Structure, Isotopes & Electron Shells (2026/27 exams)

⭐️ Check out our website https://www.cognito.org/ ⭐️ *** WHAT'S COVERED *** 1. Atomic Structure * The subatomic particles: protons, neutrons, and electrons. * The relative mass and charge of each subatomic particle. * The arrangement of particles within the atom (nucleus and electron shells). 2. Understanding the Periodic Table * How to interpret nuclear symbols for elements. * The meaning of the atomic number (proton number). * The meaning of the mass number (protons + neutrons). 3. Isotopes * The definition of an isotope. * How isotopes of an element differ in their number of neutrons. * The concept of unstable isotopes and radioactive decay. 4. Electron Energy Levels * How electrons are arranged in shells or energy levels. * The process of electrons absorbing energy to move to higher energy levels (excitation). * How electrons emit electromagnetic radiation when falling back to lower energy levels. 5. Ionisation * How an atom becomes a positive ion by losing an electron. * The role of energy absorption in ionisation. * The definition of ionising radiation. *** CHAPTERS *** 0:00 Introduction to the Atom 0:26 Structure of the Atom (Protons, Neutrons & Electrons) 1:02 Understanding Nuclear Symbols 1:27 Atomic Number (Proton Number) 1:50 Mass Number (Protons & Neutrons) 2:25 The Definition of Isotopes 3:05 Radioactive Decay of Unstable Isotopes 3:36 Electron Shells & Energy Levels 3:55 Excitation of Electrons 4:38 How Ionisation Creates Positive Ions *** PLAYLISTS *** https://youtube.com/playlist?list=PLidqqIGKox7VzYfPIVt8T09xOLNcolCe4&si=8JmDajxjtba6rdc3 https://youtube.com/playlist?list=PLidqqIGKox7UZ3mWhbHv2aA_1vnbsfRPq&si=q3hEKdA4v7kbfwMe https://youtube.com/playlist?list=PLidqqIGKox7XPh1QacLRiKto_UlnRIEVh&si=orIUwL3o2jOoiYjT https://youtube.com/playlist?list=PLidqqIGKox7X5UFT-expKIuR-i-BN3Q1g&si=DcihOwUkd9oWbbdp https://youtube.com/playlist?list=PLidqqIGKox7WeOKVGHxcd69kKqtwrKl8W&si=Y8MsO-FK948jnxpS https://youtube.com/playlist?list=PLidqqIGKox7UVC-8WC9djoeBzwxPeXph7&si=-7i5Iq7yOeJrhtu6 https://youtube.com/playlist?list=PLidqqIGKox7VKJD2WxRhoKaI6JGLVean8&si=NH_Q1ujhVgACM2FU #GCSE #Chemistry #study #revision #school #exam #AQA #OCR #Edexcel #IGCSE