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Download
It's fully functional, with the exception that you can only view data from some of the elements.
Once you register, you can view data from all elements.
The Atomic Mac macOS - Periodic Table of the Elements, 64 Bit Application for macOS 10.9.5 through 10.15 Catalina, dmg Disk Image format.
(Version 7.0.0, 64 bit application 17 April 2019)
The Atomic PC - Periodic Table of the Elements.
(Version 6.9.5, 4M)
Also available in ZIP format.
The Atomic Penguin - Periodic Table of the Elements. (Version 6.9.4, 4M)
Download this version if you are running Linux, Requires GTK+ 2.0 or better.
Beta Version 7.0.0b2
Atomic Mac Beta - For MacOS 9.5 and later, 64 bit app (October 20, 2019)Atomic PC Beta - For Windows 7/8/10 (October 20, 2019)
The Atomic Mac - Periodic Table of the Elements, for PowerPC, in MacBinary format.
(Version 6.7.0, 3M)
If you have an older version of MacOS, or a 68k Macintosh, please download this version instead:
The Atomic Mac - Periodic Table of the Elements, in BinHex format. (Version 4.6.1, 1362k)