4 x 1 hour lessons

This module explores patterns and trends in the periodic table. You'll begin by reviewing the layout of the periodic table and the concept of periodicity — recurring trends in properties such as atomic radius, ionisation energy, and melting point.

You’ll then study the chemistry of Group 2 elements, focusing on their reactions with water, oxygen, and dilute acids, as well as the solubility of their hydroxides and sulfates. Their use in agriculture and medicine is also discussed.

Next, you'll investigate Group 17 (the halogens), including their physical properties, displacement reactions, and reactivity trends. You’ll also look at the redox behaviour of halide ions and the role of chlorine in water treatment, including the risks and benefits.

​

By the end of this module, you’ll be able to:

• Explain and apply the concept of periodicity

• Describe and explain trends across Period 3

• Understand the properties and reactions of Group 2 elements and their compounds

• Describe and explain the physical and chemical trends in Group 17

• Predict the outcomes of halogen displacement reactions

• Evaluate the use of chlorine in water treatment

​