A periodic table of the elements is shown in standard format. Clicking on any element opens a window showing various properties of the selected element. The range of properties includes electronic, thermodynamic, and physical. Periodic is 26/32-bit neutral and should run on RISC OS 3, 4, 5 and 6, and has been tested successfully on IGEPv5 and iMX6 based hardware running RISC OS 5.23.