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Available API

Chemical Elements

All 118 named elements with identifiers, electron configuration, physical properties, classification, discovery year, and provenance.

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Status
2/2 sources healthy
Contract
1.0.0
Data version
elements-nist-isotopes-2026.08.30
Current records
118
Normal pull
none
Full reconciliation
yearly verification

Coverage

What this API contains

Complete periodic-table element knowledge with source-qualified physical properties.

elementisotopeclassificationphysical property

Endpoints

Built for direct use

/apis/elements · 1 credit/apis/elements/{identifier} · 1 credit/apis/elements/search · 1 credit/apis/elements/periodic-table · 1 credit/apis/elements/isotopes · 1 credit

Standard list, search, detail, relationship, and conversion calls cost one credit. Bulk exports cost 100 credits.

Bounded preview

See the shape of the data

These are up to five fixed records from the current release. The preview has no paging, search, or export controls. A developer account and API key are required to query the full dataset.

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Source record

Where the data comes from

Healthy

NIH PubChem Periodic Table

primary machine-readable element property dataset

Last successful pull
Aug 29, 2026 · 11:29 PM UTC
License / terms
U.S. government data; PubChem usage policies apply
Reuse review
Commercial: True · Redistribution: True
Healthy

NIST Atomic Weights and Isotopic Compositions

relative isotopic mass and natural-composition reference

Last successful pull
Aug 30, 2026 · 2:31 AM UTC
License / terms
NIST reference data and cited literature terms apply
Reuse review
Commercial: review_required · Redistribution: review_required