In the application, you will find theory and, above all, tests for elements of the Periodic Table of Elements, formulas and names of oxides, sulfides, ditrides, halides, hydroxides, and oxygen-free and oxygen-free acids. The app records statistics and detailed test results including time and correct answer to each question. Contains: - PSP - oxides - sulphides - acids - hydroxides - halides - nitrides You can also play the championship and try to place yourself in the leaderboard. Privacy po