Period 3D is a program reference manual in chemistry. The program is made in the form of Mendeleyev's table. Having clicked on any chemical element (except lanthanides and actinoids), it is possible to learn not only its properties and key parameters, but also to receive additional information. Also opportunity to make computation of amount of substance, mass of substance, volume and mass of gases is provided in the program.

Installation:
Unpack archive and launch the file from the "period" folder.