118 Elements. One Universe of Discovery.
Explore the building blocks of matter through interactive science, beautiful visualizations, and trusted chemical data.
Explore Every Atom. Understand Everything.
The Periodic Table
Hover or focus a tile for a preview; click or press Enter to open its profile. Each profile has its own link.
Rows 9–10 are La–Yb (57–70) and Ac–No (89–102). Lu and Lr sit in group 3, following the IUPAC 2021 provisional recommendation. “Atomic weight” means the abridged standard atomic weight; values in [brackets] are the mass number of the longest-lived known isotope (no standard value exists). Categories and states follow common textbook conventions, which vary between sources.
Atomic Lab
Choose an element, an isotope (mass number) and an ionic charge. Counts and the diagram update together.
Quick Quiz
Five questions, generated from the table data above.
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Sources & Honest Limitations
Reference organisations whose conventions this table follows (open the originals to check any value):
- IUPAC — periodic table, names and symbols
- CIAAW — standard atomic weights and isotopes
- NIST — physical reference data
- PubChem — element and compound data
- IAEA — nuclear and isotope data
- Royal Society of Chemistry — education and history
Data status. Names, symbols, atomic numbers, abridged atomic weights, categories and states were entered into this build by hand following those conventions. They were not retrieved or cross-checked against the live databases, so none is labelled “cross-checked”. The self-check below tests internal consistency only.
Not built yet: density, melting/boiling points, electronegativity and other property data with per-value provenance; heatmaps and the trends explorer; isotope explorer; compound and reaction labs; comparison tool; glossary and learning paths; Bangla beyond the interface labels and a few explanations (it needs expert review; element names stay in English); photographs; 3D and orbital views; profile sections for history, occurrence, uses and safety; printable sheets; per-element SEO pages. Elements 104–118 have predicted configurations and states that are not established experimentally.