Periodic Table
Explore 118 elements, atomic weights and electron configurations. Search, filter and export.
Explore the elements
Explore colour-coded element categories. Select an element to discover its chemical profile.
Swipe horizontally to explore the complete table on small screens.
Ln89–103
An
Atomic weights follow the CIAAW 2024 abridged table. — means no standard atomic weight, not zero. Some heavy-element configurations are theoretical references. Only 118 confirmed elements are included.
Queries run in your browser; search text is not uploaded. Dataset date: 2026-09-20
CIAAW · IUPAC · Periodic-Table-JSON · CC BY-SA 3.0 · Full dataset JSON
Processed content stays in this page’s memory and cannot be recovered after clearing or closing.
About this tool
Includes 118 confirmed elements. Search by name, symbol or number, filter by period and category, and select an element for details. Standard atomic weights use the CIAAW 2024 abridged table; — indicates no standard atomic weight.
How to use
- Search by element name, symbol or atomic number.
- Filter by period or category, then select an element.
- Copy details or export matching rows as CSV.
Frequently asked questions
Why do some elements have no standard atomic weight?
Some elements have no characteristic natural isotopic composition. A dash means no standard atomic weight, not zero.
Discussion & comments
Share your experience and discover more ways to use this tool.
Loading comments…