In this page we will describe the trends in atomic radius, ionization energy, electron affinity, and melting and boiling points.
Periodic Trends
Khan Academy has a fantastic video series that explains each of the trends and how they are observed on the periodic table. Click on the image to link to the site and watch the videos.
Check out the page on periodic trends over at the UC Davis website for a very lengthy and complete description of the trends.
If the UC Davis page is a little too daunting of a read for you, try a more basic page done by Texas A&M University (Warning: obnoxious web-design ahead!!!)
Periodic Trends and Electron Configurations
Professor Dave does a great job of explaining the trends of atomic radius, ionization energy,and electronegativity while showing how electron configuration plays a key role in these trends.