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Why properties repeat

Why properties repeat

Block diagram of Periods 2 and 3 showing s-block and p-block positions, no d-block in these periods, and helium placed with noble gases

The modern periodic table is arranged by atomic number, which is the number of protons in the nucleus. Periodic Law says that physical and chemical properties repeat in a regular pattern as atomic number increases.

Periodicity Lesson

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

Step-by-step lessons on OCR A 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