About This Project
The story behind PeriodicTableOfElements.org
The Origin Story
About four months ago, I apparently told someone I was going to build an interactive periodic table website. You know how it goes — you say something on the internet, and then months later someone reminds you that you actually have to do it. So when I posted on r/webdev about some free tools I'd built, I figured it was finally time to deliver.
So here it is. No excuses, no vaporware — a fully interactive, completely free periodic table of elements. Every element, every property, every electron shell diagram. Four months late, but I'd like to think it was worth the wait.
What It Does
PeriodicTableOfElements.org is a free educational resource for students, teachers, and anyone curious about chemistry. No ads, no paywalls for the core experience, no sign-up required to explore.
Interactive Periodic Table
All 118 elements. Click any element for detailed properties, electron configurations, shell diagrams, isotope data, real-world uses, and fun facts. Color-code by category, block, state, electronegativity, and more.
Temperature Slider
Drag from 0 K to 6000 K and watch elements change state in real time. See which elements are solid, liquid, or gas at any temperature — great for understanding phase transitions.
Periodic Trends
Visualize electronegativity, ionization energy, atomic radius, and density with interactive heatmaps and charts. See how properties evolve across periods and down groups.
Element Comparison
Pick up to four elements and compare them side by side — atomic mass, density, electron configuration, oxidation states, and more.
Element Quiz
Test yourself by identifying elements from their symbols, names, categories, or properties. Tracks your score and streak so you can measure improvement.
Discovery Timeline
Explore the history of chemistry from ancient metals known for thousands of years to synthetic elements created in modern particle accelerators.
For Students & Educators
Whether you're studying for an exam, teaching a class, or just curious about the building blocks of the universe — this site is built for you. Every element page includes physical and chemical properties, electron shell diagrams, isotope data, discovery history, real-world uses, and fun facts. Available in multiple languages and always free.
Made By
Built by John. I make things on the internet, sometimes on schedule, sometimes four months late. If you want to see what else I'm working on, check out nader.mx. If you have feedback, bugs, or feature requests, get in touch.