Periodic Table of Elements

All 118 chemical elements with atomic properties, electron configurations, and classifications.

Source: PubChem / Periodic Table JSON License: Public domain Last imported: 2025-06

This collection was imported by Knowledge Futures as reference data for Underlay.

Record Types

• Element — atomic number, symbol, mass, electron configuration, electronegativity, density, melting/boiling points, discovery info
• Category — element classification (alkali metal, noble gas, transition metal, etc.)