The Periodic Table Explorer is the complete reference for the elements of the periodic table. It contains over 1400 pages of (searchable) text, a glossary of terms, biographies of important chemists, lists of compounds, hundreds of scientific constants, and over two hundred images! In addition, there are lists of elements by property (melting point, discovery date, etc.).
Updated on Aug 02 2017
Note: Now requires OS X 10.10 or later