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From solid spheres to the nuclear model

From solid spheres to the nuclear model

Diagram showing an atom with a tiny nucleus and electron shells, plus a key for proton, neutron, and electron charges and relative masses

The modern model says an atom has a tiny central nucleus containing protons and neutrons, with electrons arranged in shells around it. Most of the atom is empty space, so diagrams are useful but are not to scale.

Atomic structure Lesson

  1. GCSE
  2. /Combined Science
  3. /Atomic structure

Step-by-step lessons covering Edexcel GCSE Combined Science Atomic structure for Foundation and Higher tier. Each lesson works through exam-style questions.

Lessons