Sophia Learning
Sophia: Periodic Trends: Atomic Radius: Lesson 1
This lesson will explain how the atomic radius changes over representative elements across rows and up and down columns on the periodic table. It is 1 of 3 in the series titled "Periodic Trends: Atomic Radius."
Other
University of South Carolina: Periodic Trends
PowerPoint presentation that describes sizes of atoms in terms of isoelectric series as well as periodic trends. Includes information about sizes of ions and allows you to practice some problems on your own. Go to the index to choose...
Royal Society of Chemistry
Periodic Landscapes: Atomic Radii
This website provides a short but detailed definition of atomic radii. Also shows the atomic radius plotted against atomic number.