About
A free, ad-light periodic table of all 118 chemical elements, built and maintained by a small software studio in Sweden.
What this site is
periodictable.one is an interactive reference covering all 118 chemical elements in depth. Every element has its own page with physical properties (mass, density, melting and boiling points), atomic structure (electron configuration, shells, orbital diagram), classification (category, period, block, group), discovery history and external identifiers (CAS, ChemSpider, EC, PubChem). The site is built for students, teachers, hobbyists and anyone curious about the building blocks of matter. No signup, no paywall, available in English, Swedish, Danish and Spanish.
Why it exists
Back in 2018 most of the established periodic-table sites were a mess. The data you actually came for was buried under banner ads, sticky ads, autoplay videos and three layers of cookie consent. Mobile layouts were an afterthought. Joacim kept landing on these sites looking up something simple - the density of caesium, the discoverer of seaborgium - and giving up before finding it. periodictable.one is the answer to that frustration: minimal advertising, no popups, mobile-first layout, and the chemistry on the first screen instead of behind it.
Who runs it
periodictable.one was created on 10 March 2018 by Joacim and is maintained by Injosoft AB, a small software studio based in Sweden. The site is AI-assisted in both code and copy (primarily Anthropic’s Claude), but every change is reviewed and tested by Joacim before going live. Element data is verified against Wikipedia and IUPAC sources rather than generated.
Our other sites
periodictable.one is part of a small family of focused, single-purpose reference and creative projects:
Data and accuracy
Element data is sourced from Wikipedia (CC BY-SA), IUPAC nomenclature, and standard chemistry reference works. Each element page links back to its Wikipedia source. If you spot something wrong, please get in touch - corrections are typically applied within a few days. For commercial reuse of the curated dataset, please contact us first.
Contact
Reach Joacim at joacim@injosoft.se for corrections, suggestions, partnership enquiries or just to say hi.