Periodic: Chemical Calculator app for iPhone and iPad

Hate manually doing calculations from the Periodic Table? Periodic automatically and instantly calculates the molar mass, percent composition, name, and charge of selected elements on a periodic table. This makes the task of using a periodic table for any means much faster and easier.

Functionality:
- Simply tap an element once to add one atom to the compound. Tapping multiple times will add more of that element to the compound. For example, to input C2H3O2, tap Carbon twice, Oxygen twice, and Hydrogen three times.
- To remove an element from the compound, drag down from the element.
- To entirely clear the current compound, swipe down with two fingers.
- To view more info about a compound or element, drag down from the compound name and mass labels
- To view your history, drag upwards
- To reselect a compound, simply tap on it from the history view

Features:
- Instantly updates the mass with each newly added atom
- Includes a proper element organization function that orders the chemical formula from its elemental components
- Adds a notification badge on the icon for the mass calculated when the app closed. Good for multitasking when you need to quickly see the mass without opening the app.
- Records your previous calculations so that you dont need to keep entering them
- Can instantly calculate percent composition by mass
- Can display the name and charge of many different polyatomic or special compounds