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Shells, sub-shells and orbitals

Shells, sub-shells and orbitals

Flowchart of electron sub-shell filling sequence up to 4p, showing 1s to 4p with capacities and note that 4s fills before 3d The atomic number, ZZZ, tells you how many protons an atom has. In a neutral atom, the number of electrons is also ZZZ, so sodium has 11 electrons and bromine has 35.

Electron configuration Lesson

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

Step-by-step lessons on AQA A Level Chemistry Electron configuration. 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