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Zperiod
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Zperiod For iPhone

Chemistry,
in your pocket.

All 118 elements, real 3D models and the tools you reach for every chemistry lesson. Designed from the ground up for iPhone.

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iOS 17 or later

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01 Orbitals

Orbitals,
in true 3D.

Every electron cloud, computed from the wavefunction. 16 shapes, up to n = 7.

A 4f orbital as a 3D electron density cloud
02 Spectrum

Every atom
has its own light.

Turn your iPhone for the full spectrum. Swipe from element to element.

The emission spectrum of helium in landscape
03 Table

The periodic
table, reimagined.

Every element, in depth. Free to explore.

The periodic table with element tiles floating around it
04 Photos

Real photos.
Real elements.

Hundreds of photos across all 118 elements, each with the story behind it.

The gold page with photos of native gold crystals
05 Molecules

Molecules
you can spin.

93 organic compounds in 2D and 3D, with naming practice.

Aspirin as a 3D ball-and-stick model
06 pH lab

Watch the
colour change.

A pH lab with five indicators, from litmus to phenolphthalein.

Phenolphthalein turning pink in a 3D beaker
07 Play

Balance it.
Tap by tap.

Five games that make chemistry stick.

Balancing the combustion of methane
08 Rank

Rank every
element in a tap.

Electronegativity, density, melting point, even the year it was found.

Elements ranked by electronegativity, fluorine first

No ads. No account.Just chemistry.

Free to start, with an optional Pro upgrade. Your settings and recent formulas stay on your device.

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