About ChemFYI
ChemFYI is a free, open-access chemistry encyclopedia designed for students, educators, researchers, and chemistry enthusiasts. Our mission is to make comprehensive chemistry information accessible worldwide — available in 15 languages.
What We Cover
118 Elements
Complete periodic table with properties, electron configurations, and discovery history
5,000+ Compounds
Molecular data, physical properties, safety hazards, and everyday uses
Reactions & Experiments
Balanced equations, reaction mechanisms, and step-by-step lab protocols
180 Guides & 200 Terms
In-depth educational articles across 12 series, plus a comprehensive glossary
For Developers
ChemFYI offers a REST API with 20 endpoints, OpenAPI documentation, and markdown endpoints for every page. Append .md to any page URL to get machine-readable content.
Contact
Questions, corrections, or feedback? Visit our contact page.