Science
The Periodic Table Quiz
Elements, symbols, and atomic numbers — time to dust off that chemistry brain.
Elements, symbols, and atomic numbers — time to dust off that chemistry brain.
The periodic table organizes all 118 confirmed elements by atomic number, electron configuration, and recurring chemical properties. This quiz draws from a pool of 10 questions covering element symbols, atomic numbers, noble gases, and naming origins — rated hard difficulty for chemistry enthusiasts.
Each round presents 10 multiple-choice questions. Pick your answer, get an instant explanation tracing element names back to their Latin roots, and see your final score. Questions are randomized each attempt, so replay as many times as you like.
Questions span element symbols derived from Latin (Au for gold, Fe for iron, Pb for lead), atmospheric composition, the lightest metals, and elements named after planets. One fact worth knowing: lithium is so light it can float on water, making it the least dense metal on the periodic table.
There are 118 confirmed elements on the periodic table as of 2026. The four most recently added elements — nihonium (113), moscovium (115), tennessine (117), and oganesson (118) — were officially named in 2016. Elements beyond 118 have been theorized but not yet synthesized.
Astatine is the rarest naturally occurring element on Earth, with estimates suggesting less than 30 grams exist in the entire Earth's crust at any given time. It is a radioactive halogen with a half-life of just 8.1 hours for its most stable isotope, astatine-210.
Dmitri Mendeleev, a Russian chemist, published the first widely recognized periodic table in 1869. He arranged 63 known elements by atomic weight and predicted the existence and properties of several undiscovered elements, including gallium and germanium, which were later found to match his predictions closely.
Last updated: March 2026