Topic 3 – Periodicity – Trends in the Atomic Radii

Yesterday I dealt with electronegativity. Once your students are secure in this concept, you will be able to expand upon your teaching of this topic. Section 3.2.2 and 3.2.3 of the syllabus deals specifically with trends both across period 3 and down group 1 and 7. In order to understand the concepts involved, your students will need to be familiar with the electron arrangement in atoms and the concept of shielding (of outer shell electrons by inner shells), as well as the ...