2.1 Periodicity

Periodic Table for A level

Periodic Table for A level

The Periodic Table provides chemists with a structured organisation of the known chemical elements from which they can make sense of their physical and chemical properties.
The historical development of the Periodic Table and models of atomic structure provide good examples of how scientific ideas and explanations develop over time.




  • Periodicity classification as s, p, d or f block - An element is classified as s, p, d or f block according to its position in the Periodic Table, which is determined by its proton number.
  • Physical properties of Period 3 elements - The trends in atomic radius, first ionisation energy and melting/boiling points of the elements Na–Ar Students should be able to: • explain the trends in atomic radius and first ionisation energy • explain the melting point of the elements in terms of their structure and bonding. Key unifying theory : Effective nuclear charge density                  


Periodicity table quiz (lesson)



Boardworks simulations (match the ionisation energy, ionisation energies of the first 54 elements)