Using this site
PeriodicElementTable.com is provided free of charge for educational and informational purposes. You're welcome to browse, read, and use the calculators for personal, academic, or classroom use.
Accuracy of information
We take scientific accuracy seriously — every data point on this site is sourced from public-domain scientific databases (see SOURCES.md in the project repository), and we'd rather show "not yet available" than guess at a number. That said, this site is provided "as is," without warranty of any kind. It's a reference tool, not a substitute for a peer-reviewed source, a lab manual, or professional scientific advice — always verify critical figures against a primary source before relying on them for research, safety-critical, or professional work.
Content and intellectual property
Raw scientific facts (atomic numbers, masses, and similar measured properties) are not subject to copyright. The original written content on this site — element write-ups, FAQs, blog posts, and the site's design — is our own work and is protected by copyright. You're welcome to quote and link to it; please don't republish it wholesale without permission.
Free printables
The PDFs on our printables page are free for personal and classroom use. You may print as many copies as you need and share the link to the page. You may not sell them, include them in paid products or bundles, or re-upload the files to other websites. Please link to the printables page instead, so people always get the latest, corrected version.
Tools and calculators
Tools like the molar mass calculator run entirely in your browser and are meant to help with learning and quick calculations. As above, they're provided without warranty — double-check results that matter for graded work or real-world applications.
Acceptable use
Please don't attempt to disrupt the site (automated scraping at abusive volume, attempts to break or exploit the site's tools, etc.). Reasonable automated access for research or archival purposes is fine.
Changes
We may update these terms as the site evolves (new tools, the addition of advertising, digital products, and so on). Continued use of the site after a change means you accept the updated terms.
Contact
Questions about these terms? Reach us at hello@periodicelementtable.com.