Element Facts API

Use this API for lightweight periodic-table facts without maintaining your own element reference table. It exposes normalized JSON endpoints with practical filters, source metadata, and lightweight reference tables so developers can add lookup and discovery features without maintaining their own scraper or curation pipeline.

Science live chemistryperiodic-tableelementswikipedia

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Use Cases

add periodic-table search to learning apps
normalize element names and symbols
power chemistry reference widgets

Access

These endpoints are served through RapidAPI. The examples below are documentation examples, not direct browser links, because requests require RapidAPI authentication headers.

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Endpoints

GET/api/elementfacts/elements

List elements or filter by symbol, name, block, phase, or atomic number.

Query parameters: symbol, name, block, phase, atomic_number

/api/elementfacts/elements?name=example

GET/api/elementfacts/blocks

List known periodic table blocks.

/api/elementfacts/blocks

Pricing

Basic: $0/day for 10 requests. Evaluation tier for testing the API in prototypes.
Pro: $9/month for 10000 requests. Small production apps, internal tools, and niche content sites.
Business: $29/month for 100000 requests. Higher-volume apps, catalog enrichment, and recurring data workflows.

Data Notes

Source: Wikipedia. Refresh cadence: 30d. Records include source attribution when exposed by the API response.

Primary table: elements