Atomic Structure & Mass Spectrometer | A level Chemistry exam question walkthrough

This video is a full A‑Level Chemistry exam‑question walkthrough on Atomic Structure and the Time of Flight Mass Spectrometer, taking you through the reasoning, the explanations, and the calculations exactly the way examiners expect. You can also download the full exam question using the link below. https://drive.google.com/file/d/1tOBsoImZjFxOc-89dREh-ovV0xU6h-1p/view?usp=sharing Links directory for all YouTube videos: https://drive.google.com/file/d/1s3I5prjbJRR1U1lcKpXO9TQpQMaVoP66/view?usp=drive_link This walkthrough shows the exam‑marking points in purple, and the thinking‑out‑loud development and annotations in red/purple, so you can clearly see what earns marks and what helps you understand the logic behind the chemistry. What this walkthrough covers (no spoilers) Comparing atomic models (Thomson vs modern) Understanding relative atomic mass How the periodic table is organised Writing ionisation equations Time of Flight mass spectrometer calculations The TOF process Long‑answer reasoning with clear, examiner‑friendly steps Timestamps 00:00 Introduction 00:05 How to use the walkthrough 00:49 Comparing atomic models (Thomson vs modern) 03:13 Relative atomic mass, periodic table organisation & ionisation equations 08:20 TOF mass spectrometer calculations 13:31 TOF mass spectrometer process Perfect for AQA Paper 1, OCR A, OCR B (Salters), and anyone revising atomic structure and mass spectrometry.