The PSE project is open source. This also applies to the data used on this website. These are provided under the MIT license and can be downloaded as needed.

The data provided on this website do not claim to be correct, complete and up-to-date. They come from reference books, Wikipedia, WebElements and other websites. assumes no liability for the use of this data and points out to use further sources if necessary.

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Atomic, physical, etc. properties of all chemical elements.

Last edited on Tuesday, January 30, 2024
File size: 700 kB


Spectral lines of all chemical elements in base64 format.

Last edited on Friday, October 13, 2023
File size: 133 kB

The complete source code of and the data used on this website are provided open source under the MIT license via the GitHub repository @komed3/periodic-table. Errors can be reported under this link or by email to