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, visitors can test their knowledge with the "Name That Atom" game. The game is full of protons, neutrons, and electrons, but it should be no problem for students who've been paying attention to this lively exploration of the atom. Moving on through the site, visitors will learn about the periodic table's organization, isotopes, and the groups within the table, all the way from the alkali metals to the boron family.