Encyclopedia of Earth
Encyclopedia of Earth: Barium
Basic information about the element, Barium, atomic number 56. Covers physical and atomic properties, how abundant it is on the Earth, and permissible exposure limits.
Web Elements
Web Elements Periodic Table: Barium
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.
TED Talks
Ted: Ted Ed: Barium: Periodic Table of Videos
The team at periodicvideos has created a TED-Ed Lesson for every element of the periodic table. This one is about element number 56. [7:50]
Other
Yahoo! Health: Barium Enema
A nice overview from Yahoo! Health of the common medical procedure known as the barium enema. Describes the procedure and how and why it is used. Also includes preparations and risks involved. Images are also provided.
Chemicool
Chemicool: Barium
A very easy to follow site from Chemicool with all sorts of clearly presented data on barium. Not flashy, but thorough and clear,