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), and the mole explainer with its printable classroom poster, 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.