Element data API

Plain JSON files, no key, no rate limit beyond ordinary web hosting, CORS enabled. Built for teachers' spreadsheets, student projects and AI assistants that want a stable source to cite.

Endpoints

Address	Contents
`/api/elements.json`	All 118 elements, one compact record each: number, symbol, name, mass, family, state, group, period, block, density, melting and boiling points (K), electronegativity, page and API links.
`/api/elements/<name>.json`	One element in full: every numerical property, electron configuration, shells, ionisation energies, discoverer, image with attribution, plus the site's original tagline, introduction, sections, facts and FAQs. Example: `/api/elements/carbon.json`. Names are lower-case English: `aluminium`, `sulfur`, `cesium`.

Example

fetch('https://periodicbubbles.com/api/elements/gold.json')
  .then(r => r.json())
  .then(el => console.log(el.name, el.melt_c, el.tagline));

Units and conventions

Temperatures in kelvin as melt and boil, with melt_c and boil_c in degrees Celsius for convenience.
Density in g/cm³ for solids and liquids, g/L for gases. Atomic mass in unified atomic mass units. Energies in kJ/mol.
Values for the synthetic superheavy elements are predictions, not measurements. The element text says so where it applies.

Licence and attribution

Numerical data comes from Periodic-Table-JSON under CC BY-SA 4.0, with two corrections noted in each file's _meta. The written content is copyright Periodic Bubbles and may be quoted with attribution and a link to the element's page. If you build something with it, tell us; we would like to link to it.

Every file carries a _meta block with the generation date, licence and units. Files are regenerated whenever the site is rebuilt; addresses are stable.