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What is periodicity? What are the trends of atomic radii, ionisation energy and melting points across a period? All this and more covered in this comprehensive lesson with questions and answers! This is a Year 12 A level lesson for Edexcel International Unit 1 – WCH11, but it can also be used for all UK exam boards. All the slides in this lesson are fully animated and include answers to every mini plenary question and exam question. The breakdown of the slides (which are best opened on Microsoft PowerPoint) is as follows:

Slide 1 - Title and 5-minute starter. The starter is a grid of four questions entitled ‘last week, last lesson, today’s learning and future learning’. Use this generic slide for all of your lessons by simply changing the questions and the answers each time.
Slide 2 - Lesson objectives (see thumbnail image)
Slide 3 – A picture of the periodic table divided into its respective blocks
Slide 4 – Definition of s, p and d block element
Slide 5 – Definition of periodicity
Slides 6 - 8 : atomic radii, what it is and why it decreases across a period
Slides 9 – 12: melting and boiling temperatures across a period and the explanation linking to the structures of the elements
Slides 13 – 20: the trend in ionisation across a period (increase) has already been discussed in the previous lesson – this section focuses on the exceptions to this rule, namely, group 2/3 and group 5/6. These anomalies are explained using Boron vs Beryllium and Nitrogen vs Oxygen as exemplars.
Slides 21 – 27: Exam questions with mark scheme answers (included with the purchase of this resource)

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