Interactive Periodic Table
Explore all 118 elements. Hover to preview, click to see full details including electron configuration, physical properties, and common uses.
About the Periodic Table
The periodic table organizes all known chemical elements by increasing atomic number (number of protons). Elements in the same column (group) share similar chemical properties because they have the same number of valence electrons. Elements in the same row (period) have the same number of electron shells.
Dmitri Mendeleev published the first widely recognized periodic table in 1869, arranging elements by atomic mass and predicting the existence of elements not yet discovered. The modern table arranges elements by atomic number, as established by Henry Moseley in 1913.
How to Read an Element Block
Top: Atomic number (number of protons)
Center: Element symbol
Bottom: Atomic mass (in g/mol)
Color: Element category