Kalzium provides you with all kind of information about the
PSE (Periodic System of Elements.) You can lookup
lots of information about the elements and also use visualizations to
show them. It is free and licensed
under the GNU Public License.
You can visualize the Periodic Table of the Elements by blocks, groups, acidic behavior or different states of matter. You can plot data for a range of elements (weight, mean weight, density, IE1, IE2, electronegativity). You can go back in time and see what elements were known at a given date. You will also be able to check your knowledge by taking a quiz.