Kalzium is your digital replacement for the periodic table on paper. It is a program that visualizes the Periodic Table of Elements (PSE) and includes basic information about all common elements in the PSE. It has a gained much more functions over time.
Features

    * versatile overview of all important data from the elements like melting points, electron affinity, electronegativity, electron configuration, radii, mass, ionisation energy
    * tool to visualize the spectral lines of each element
    * different colored views of the PSE: separation of the different blocks, Year simulator, Temperature simulator
    * Molecular weight calculator
    * an Isotope table
    * 3D molecule editor, with a load and save functionality
    * an equation solver for stoichiometric problems
    * filetype conversion for different types of chemical programs
    * tool to produce a comprehensive list of all Risk_and_Safety_Statements

Origin:http://edu.kde.org/applications/science/kalzium/