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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 on Edexcel A Level Chemistry Atomic structure. 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