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Atomic number, mass number and nuclide notation

Atomic number, mass number and nuclide notation

Nuclide notation for aluminium-27 ion with labels for mass number, atomic number, charge, and particle counts

The atomic number, ZZZ, is the number of protons in the nucleus. The mass number, AAA, is the total number of protons and neutrons, so it counts the nucleons.

Mass number and isotopes Lesson

  1. A Level
  2. /Chemistry
  3. /Mass number and isotopes

Step-by-step lessons on AQA A Level Chemistry Mass number and isotopes. 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