Periodic Table of Elements of chemistry with all essential information. Try it, really good for Chemistry Students. You will get all info of Elements like this: Element: Hydrogen. Symbol: H. Atomic Number: 1. Mass Number: 1. Atomic Mass: 1. 0079 g/mol. Density: 0. 0899 g/cm3. Oxidation States: 1. Electron Configuration: 1s1. State: Gas. Melting Point: 14. 025 k.