Aurum: Periodic Table & Quiz

Every element starts as lead. Master it, and it transmutes: copper, silver and, at last, gold. Aurum is a periodic table and a chemistry game in one: all 118 elements, isotopes, reactions, a molar mass calculator and puzzles that test what you've learned.

NO ADS. NO SUBSCRIPTIONS. NO ACCOUNTS.

Everything about all 118 elements and every tool is free forever. Aurum works offline and collects no data at all. Valence, electronegativity, oxidation states, electron configuration and isotopes: all free.

AURUM PRO: ONE OPTIONAL PAYMENT

One optional one-time purchase unlocks the full game: all 118 elements on your way to gold, all 70 levels of The Forge, and the blind table in Blitz. No subscription, and knowledge is never paywalled.

A TABLE THAT COMES ALIVE

• Slide the temperature and watch elements melt and boil, live

• Travel through time, from antiquity to 2016, one discovery at a time

• Lenses for electronegativity, density, radius, ionization, abundance and more

• Zoom and landscape, so nothing is too small to read

EVERY ELEMENT, IN DEPTH

• Real quantum orbitals, calculated from the wavefunction

• Real emission spectra from the NIST database

• Over 3,300 isotopes with half-life and abundance

• 3D atoms and crystal lattices you can spin with your finger

• Real photos, uses, surprising facts and history

• Nuclide map: every known isotope on one chart you can zoom

• 62 molecules in 3D with real geometry, from water to caffeine

PLAY

• Free practice: memorize any elements by symbol, name, number, atomic mass or position

• Daily: one element to guess, the same for the whole planet

• The Forge: trace bonds to forge real compounds

• Blitz: 60 seconds and the whole table, even blind

• Your name written in elements, ready to share

• A home screen widget with the element of the day

LABORATORY

• Molar mass, equation balancer and element comparison

• 158 reactions with their conditions

• Solubility chart and a 200-term chemistry dictionary

• Trend charts and rankings

• Calculators for solutions, dilutions, gases and pH, plus physical constants

• Electrochemical series, with the voltage of any cell you build

Data from IUPAC, NIST, IAEA and PubChem. Designed for color-blind players too, with Night and Parchment themes.