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Shells and the 2n22n^22n2 Rule

Shells and the 2n22n^22n2 Rule

At GCSE, you probably met electron arrangements like 2,8,1 for sodium. While this simple shell model is helpful, A-Level Chemistry requires a deeper quantum model: electrons occupy specific atomic orbitals grouped in sub-shells within main energy levels called shells.

Electron structure Lesson

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

Step-by-step lessons on OCR A A Level Chemistry Electron 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