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1.2.2 Development of the periodic table
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Why the periodic table developed

Why the periodic table developed

Early scientists arranged elements using atomic weight because protons and electrons were not yet known. Atomic weight is a historical term for the relative mass of an element, based on the masses and relative abundances of its isotopes. This sometimes made atomic-weight ordering problematic.

1.2.2 Development of the periodic table Lesson

  1. GCSE
  2. /Chemistry
  3. /1.2.2 Development of the periodic table

Step-by-step lessons on AQA GCSE Chemistry 1.2.2 Development of the periodic table. Each one builds up to exam-style questions. Nail the core quantitative topics — moles, balancing equations and calculations — early on, since they underpin higher-tier questions across every paper and topic.

Lessons