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Inside an atom

Inside an atom

Labelled atom showing nucleus, protons, neutrons, electron shells and isotope notation

An atom has a tiny central nucleus made of protons and neutrons, with electrons in shells around it. The nucleus is positive overall, while electrons are negatively charged.

6.1 Atomic structure and isotopes Lesson

  1. GCSE
  2. /Physics
  3. /6.1 Atomic structure and isotopes

Step-by-step lessons on Edexcel GCSE Physics 6.1 Atomic structure and isotopes, covering 6.1.1 Structure of the atom, 6.1.2 Isotopes: atomic and mass number, 6.1.3 Sub-atomic particles: masses and charges, and 6.1.4 Electron orbits and energy changes. Each one builds up to exam-style questions. Master the required practical work and core equations early, since both papers can draw on content and maths skills from across the whole specification.

Lessons