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Atomic structure
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Inside the atom

Inside the atom

Labelled atom showing nucleus with protons and neutrons and electrons in shells, with charges and relative masses

Atoms are made of three subatomic particles: protons, neutrons and electrons. Protons and neutrons are found in the nucleus, while electrons occupy shells or energy levels around the nucleus.

Atomic structure Lesson

  1. A Level
  2. /Chemistry
  3. /Atomic structure

Step-by-step lessons covering Edexcel A Level Chemistry Atomic structure for A Level Chemistry. Each lesson works through exam-style questions in Paper 1, Paper 2 and Paper 3 format. 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.