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Kalzium.png Kalzium is an information system about periodic system of the chemical elements.

It is part of the KDE Education Project.

Kalzium welcome.png

Kalzium is an application which will show you some information about the periodic system of the elements. Therefore you could use it as an information database.

Kalzium has already some nice features but there are still a lot of things to do. As Kalzium has been included in KDE 3.1 we are currently coding quite lot to bring in some new and nice features and make it as fast and usefull as possible. You can help us by testing it or make proposals for new features or a better design.


  • versatile overview of all important data from the elements like melting points, electron affinity, electron negativity, electron configuration, radii, mass, ionisation energy
  • tool to visualize the spectral lines of each elements
  • different colored views to the PSE: separation of the different blocks, Year simulator, Temperature simulator
  • Molecular weight calculator
  • an Isotopetable
  • 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 comprehesive list of all Risk_and_Safety_Statements


Kalzium periodic table.png
The main window of Kalzium shows you the periodic table. You can choose between different color schemes.

Look at more screenshots...



There are several chemical applications out there. This is a list of the ones we find especially useful.

XDrawChem is a Qt-based application to draw molecular structures.
With Jmol you can view molecules inside your browser. All you need is java enabled in your browser.
The Gnome Chemistry Utils provide C++ classes and Gtk+-2 widgets related to chemistry.
This Windows™ software package - free for students, runs via wine on Linux - is in my opinion the best drawingapplication. It is really almost perfect and even supporting a 3D-viewer.
ChemTool is a GTK application for drawing chemical structures.
Open Babel
Open Babel is a project designed to interconvert between many file formats used in molecular modeling and computational chemistry.

Since KDE4, Kalzium is using OpenBabel (2.1+) if you have it installed. It is used to calculate and display 3D-structures in a OpenGL-based moleculeviewer


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