Zperiod: Learn Chemistry

See the periodic table the way it really looks. Zperiod brings all 118 elements to life with real photos, 3D orbitals you can turn and zoom, a tiltable 3D beaker for pH experiments, organic molecules and chemistry games, in 40 languages. Made for students, teachers and anyone curious about chemistry. Trusted by 1.4 million learners on zperiod.app. FREE, ALWAYS • Interactive periodic table, colored by category, phase or block • Search any element by name, symbol or number • Element pages: electron shells and orbitals, physical properties, uses and safety • Molar Mass calculator with mass composition • Solubility rules ZPERIOD PRO Try it free for 7 days, then choose a yearly plan or pay once for lifetime access. • 3D orbitals: turn and zoom all 16 orbital shapes (s, p, d and f) • pH lab: drop in titrant and watch the indicator change color in a 3D beaker • Reaction Predictor: type the reactants and read the balanced equation • Organic Chemistry: molecules in 2D, skeletal and 3D, plus naming practice • Play: balance equations, identify reaction types, build the periodic table, sort acids and bases, match element symbols • Real photos: hundreds of pictures across all 118 elements, each with its story • Emission spectra and full element data: isotopes, bonding and reactivity, advanced data and neighbor comparison • Arrange each element page the way you study The yearly plan renews automatically unless you cancel at least 24 hours before the end of the period. Manage or cancel it any time in your Apple ID settings. The one-time lifetime purchase works with Family Sharing. Prices vary by region. PRIVATE BY DESIGN No ads. No accounts. No tracking. Your studying, settings and recent formulas stay on your device. Zperiod is made by one student. The website, zperiod.app, stays free for everyone. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://zperiod.app/privacy