The Periodic Table of Elements
All 118 elements, one click away. Search by name, symbol, or atomic number. Click any element for atomic mass, electron configuration, discoverer, fun facts, and real-world uses.
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What is the periodic table?
A chart that organizes every known chemical element by atomic number (the number of protons in an atom) and groups elements with similar properties into the same column. The shape encodes decades of chemistry research.
How do I read it?
Rows are called periods; they correspond to electron shells. Columns are called groups; elements in the same group have the same number of outer electrons and therefore similar chemistry. The two rows beneath the main table are the lanthanides and actinides.
Why are some cells colored?
Color marks the element category — alkali metals, transition metals, halogens, and so on. Use the legend above the table to filter by category, or search for a specific element.