Periodic table
An atlas of matter. Explore the elements, follow a family and compare the building blocks of our world.
- 118 elements
- Search & compare
- Electron shells
Swipe to explore the table. Arrow keys move between elements.
The elements of our world
Choose an element to exploreCompare
Choose up to three elements to compare their properties.
Rounded reference values. Families and the placement of group 3 can vary between tables; this layout places La and Ac in group 3. IUPAC ↗
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Read the elements
An element’s atomic number is its number of protons. The table orders elements by that number, from hydrogen to oganesson. Rows are periods; the 18 main columns are groups. Colors identify chemical families, so patterns are easier to follow.
Choose any element to open its reference card: symbol, relative atomic mass, state at 20 °C, period, group, block, discovery and electron configuration. The ring diagram shows electron counts by shell, not physical orbital paths.
Find, filter, compare
Search in English or French by name, by symbol such as Fe, or by atomic number such as 26. Combine a family with a physical state to narrow the table. Open up to three elements and choose Compare to read their properties side by side.
On a phone, readable cards appear first. Switch to Table to pan across the full arrangement. On a keyboard, the arrow keys move between table cells; Enter opens a card and Escape closes it.
A reference with context
Masses are rounded reference values. A bracketed value is an isotope’s mass number rather than a standard atomic weight. States and classifications are left unknown where the source lacks a firm assignment; superheavy electron configurations are labelled as predicted.
For authoritative values and further reading, consult IUPAC and the Royal Society of Chemistry. Each element card links to its RSC reference.
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