CK-12 Foundation
Ck 12: Physical Science: Groups With Metalloids
[Free Registration/Login may be required to access all resource tools.] Explores group 13-16 elements (metalloids) and their properties.
Clackamas Community College
Clackamas Community College: Chemical Groups
This site, which is provided for by the Clackamas Community College, gives a basic explanation of Chemical Grouping, including the Boron group.