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Evidence changed the atomic model

Evidence changed the atomic model

Rutherford alpha scattering experiment showing most alpha particles pass through thin gold foil, some are deflected, and a very few reflect backward

Atomic models changed when new evidence no longer matched the old idea. Dalton described atoms as tiny solid spheres, but Thomson's discovery of the electron showed atoms had internal structure.

Fundamental particles Lesson

  1. A Level
  2. /Chemistry
  3. /Fundamental particles

Step-by-step lessons on AQA A Level Chemistry Fundamental particles. Each one builds up to exam-style questions. Build confidence with atomic structure, bonding and moles calculations early on, since these underpin the more demanding organic mechanisms, equilibrium and practical-analysis topics that dominate Year 2.

Lessons