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Models of the atom

Models of the atom

Timeline of atomic models from Dalton to Bohr showing solid sphere, plum pudding, nuclear model, and shell model

Atoms are the smallest particles of an element that still keep that element's chemical properties. Scientists use models to explain what atoms are like inside, and these models changed when new evidence appeared.

Atomic structure Lesson

  1. GCSE
  2. /Chemistry
  3. /Atomic structure

Step-by-step lessons covering OCR GCSE Chemistry Atomic structure for Foundation and Higher tier. Each lesson works through exam-style questions in Paper 1 and Paper 2 (Foundation Tier) or Paper 3 and Paper 4 (Higher Tier) format. Nail the core quantitative topics — moles, balancing equations and calculations — early on, since they underpin higher-tier questions across every paper and topic.

Lessons