It can be tricky to remember the position of lanthanides within the periodic table of elements, but this interactive feature from Annenberg Media's "Interactive" series will keep students in the know about those so-called "rare earth" elements. This particular feature begins with "Atomic Basics", which provides an overview of the atom and its various functions. After completing this section,...

As part of the much larger commercial site ScienceMaster, the Physical Science page Homework Helper contains an interactive periodic table, scientific calculator and several glossaries of related terms. The site also provides length, area, mass, and temperature equivalency converters and even a weight calculator to determine how much you would weigh if you were on the moon or one of several...