Periodic Table
All 118 elements with every key property — atomic mass, category, electron configuration, electronegativity, phase and discovery year. Search, hover for a quick look, click for the full picture.
Tip: on small screens, swipe the table sideways. Lanthanides (57–71) and actinides (89–103) sit in the two rows below the main table.
- Atomic number
- Atomic mass
- Group
- Period
- Block
- Phase at STP
- Electron config.
- Electronegativity
- Discovered
A reference that never needs the internet
The full dataset — atomic masses (2021 IUPAC standard values; bracketed mass numbers for elements with no stable isotope), shorthand electron configurations, Pauling electronegativities where defined, phases at standard conditions and discovery years — is embedded right in this page. Color the table by category, phase or s/p/d/f block, search by name, symbol or number, and copy any element's summary or download the whole dataset as JSON or CSV. No account, no upload, works offline. Free forever.