A great WebElements site for all sorts of information on aluminum. Content includes a break-down of the essentials, a nice description of the element (complete with an audio version), and an overview of the isolation aluminum. aluminium. Very helpful and thorough.
Basic information and data on the element barium. Useful for students at a variety of levels. Includes examples of chemical reactions, as well as information on the properties of this element. Very helpful site.
A very helpful site with all sorts of useful information on the element bismuth, along with photos and some important reactions. Also includes an audio description of this element.