The goal is to drag element symbols onto their correct positions in the periodic table. Some site information is only in Czech language. A Javascript based periodic table. Files only contain elements' symbols, names and atomic number. Features a molecular mass calculator.
Data includes spectroscopic terms and Xcore.
Includes historical information about the elements in Italian, but the table itself is in English. Help build the largest human-edited directory on the web. The content of the Google directory is based on the Open Directory and is enhanced using Google's own technology.