Terms of Use

Last updated: September 2026

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.

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 [email protected].