Test your periodic table knowledge! Score as high as you can.
The periodic table organises all 118 known chemical elements by atomic number, electron configuration and recurring chemical properties. Created by Dmitri Mendeleev in 1869, it remains the most important reference in chemistry and physics.
Click any element to see full details — atomic mass, electron configuration, melting point, boiling point, uses and a fun fact. Use the search bar to find elements by name, symbol or number. Filter by category using the legend. Take the quiz to test your knowledge!
Elements are grouped as: Alkali metals, Alkaline earth metals, Transition metals, Post-transition metals, Metalloids, Nonmetals, Halogens, Noble gases, Lanthanides and Actinides. Each group shares chemical and physical properties.
✓ All 118 elements with full data
✓ Click-through element detail panel
✓ Search by name, symbol or atomic number
✓ Filter by element category
✓ Element quiz game
✓ Printable / PDF export
✓ Mobile responsive
Copper (Cu, atomic number 29) is one of the first metals used by humans — since 9000 BC. Its symbol Cu comes from Latin "Cuprum." It is an excellent conductor of electricity and is found in wiring, plumbing, coins and bronze alloys. The Statue of Liberty is made of 80 tons of copper.
Atomic weights follow IUPAC 2021 standard. Electron configurations are per the Aufbau principle with known exceptions noted. Physical properties (melting/boiling points, density) are at standard conditions (STP) unless stated otherwise.