Click each element on the periodic table to test your chemistry knowledge. All 118 elements, from Hydrogen to Oganesson.
The periodic table is chemistry's most elegant map, organizing every known element by atomic number, electron configuration, and recurring chemical properties. Dmitri Mendeleev published the first recognizable version in 1869, and the table has since grown from roughly sixty known elements to the full 118 that occupy it today — a sweep that runs from hydrogen, the lightest gas in the universe, all the way to oganesson, a synthetic super-heavy element first produced in a laboratory in 2002.
Each column tells a story about reactivity. The alkali metals on the far left burst into flame with water; the noble gases on the far right are so chemically content they barely react with anything. Between them sit the transition metals that built the industrial age, the metalloids that power semiconductors, and the lanthanides and actinides — rare earths that hide in your smartphone, your MRI machine, and the core of every nuclear reactor.
How many elements can you place without hesitation? Find each one by its name and click the correct square on the table.
