This is a convenient chemistry tool for students and professionals to calculate molecular mass (molecular weight) of compounds and learn basic properties of chemical elements on iPad. Main features: 1. Unique elements keyboard and digits keyboard are provided for user to input a chemical formula and then calculate its molecular mass. 2. User can also search an element and use it to build a chemical formula. 3. Tapping on the number of H2O to change its value for hydrate. 4. Long pressing on an element key, the app will display the basic properties of the element. 5. Provides English pronunciations of all elements' name. 6. Provides common ions, acids and bases reference 7. "Tap Tap Elements" game makes the learning of the Periodic Table and elements more engaging.