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Reading the periodic table

Reading the periodic table

Period 3 row from sodium to argon labelled s-block and p-block, with arrows showing increasing nuclear charge, decreasing atomic radius, generally increasing first ionisation energy, and increasing electronegativity to chlorine

Periodicity is the repeating pattern in properties when elements are arranged in order of increasing atomic number. The regular pattern comes from regular changes in electron configuration.

Periodicity Lesson

  1. A Level
  2. /Chemistry
  3. /Periodicity

Step-by-step lessons on Edexcel A Level Chemistry Periodicity. 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