Periodic Table offers quick access to a wide variety of atomic properties (it is recommended that you keep an alias to the program in your Apple menu). With Periodic Table: Relative values of many atomic properties on the periodic table are viewable as color scales. Quick molecular weight calculations are readily available. A user-friendly interface is a feature. You can choose a table to view at startup. You can use the control and design help to emphasize relationships between elements. For more detailed information, including on updates, please read the documentation or visit the home page.