Attribution
Licenses & attribution
Our reference content
The interactive periodic table and its per-element reference pages, along with the printable periodic table PDFs (the tables, the element posters, the blank worksheet, and the flashcards), are licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) license. Teachers and students may use, copy, link, and share them for noncommercial purposes with attribution to Periodic Mole; modified versions and commercial redistribution require permission. The rest of the site—the games, the spaced-repetition decks, game and character artwork, and sound—is © Periodic Mole, all rights reserved.
OpenStax Chemistry
Some of our topic concept pages adapt explanatory text from OpenStax Chemistry 2e and Chemistry: Atoms First 2e, used under the Creative Commons Attribution 4.0 International (CC BY 4.0) license. Adaptations are our own; OpenStax does not endorse Periodic Mole, and we use no OpenStax marks. Each adapted page carries its own per-page attribution.