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A lot of good information, but the text-embedded ads are distracting and could potentially be confusing to high-school students, who may think they are related to the element that they selected.  One ad in particular, looked like a quiz that could be interpreted as a site-related activity.  I also noticed some grammatical errors in the "History of Carbon" section that I attribute to some sort of "find and replace" programming issue.  It said "Carbon was discovered by Known [sic] since ancient times although not recognized [sic] as an element until much later. at no data in not known."  I get what it's trying to say, but it doesn’t make grammatical sense the way that it's structured.  Again, for high school students, this would be confusing.

Wow!  I have used this site (prior to MERLOT membership) in class quite a bit...and on my own, as I was developing assignments or exams.  It's handy and reliable.  It's been accurate for every element I have used so far.  The periodic table is really the best "cheat sheet" for any chemistry class.  This one make the information behind the symbols very accessible to students.  The instant access is such a plus, and the depth of knowledge adds to its reliability.  I always caution my students on the use of web based information, and this was and is one site I have recommended to them.

En esta aplicación, los alumnos pueden revisar las caracteristicas, propiedades, reacciones, etc.,  de todos los elementos de la tabla periodica, realizando solo un click sobre el elemento de interés. Esta aplicación es una muy buena herramienta dentro del aula, de fácil utilizacion, debido a que los alumnos ´pueden interactuar y reconocer de mejor manera los elementos de la tabla periodica y sus caracteristicas.

I don't teach G-Chem anymore but this is an excellent tool for any chemist.  I have a student that I am going to recommend this this to that is currently having trouble learing the periodic table.  This really brings it to life.

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