It's a free and open source periodic table web project. Have fun ;)
Use it unlimited @ pse-info.de
- clear periodic table
- many different and interactive views
- more than 100 properties available
- internationalisation available
- easily customisable and extendable
- nuclide map
- list of all chemical elements
- API with full access to all properties
- molar mass calculator
- decay calculator
- etc.