1. & 4. I spent a few minutes trying different elements. It's easy to use and self-explanatory (if you understand the idea of atomic spectra). I especially like having both emission and absorption. 2. This is an ideal supplement to any presentation of atomic spectra. I would discourage additional text with this application that tries to explain the subject; leave that up to individual instructors. 3. I intend to use this the next time I present atomic spectra in my class intro-chem. I hope it will be effective. I may also use in in advanced inorganic.
This application works well with Internet Explorer, but poorly or not at all with Netscape v4.72 (on my Mac). Is that because the JAVA has some quirks in it that Netscape cannot understand? Maybe the author could look into that and produce a Netscape-friendly version.