Learn science element symbol 对比 元素 的使用情况和统计数据

The chemical symbol is the app to remember in the form of a periodic table. Problems are questions in 6 . Easy mode is displayed hints, but does not appear in Hard mode. If you answer all the questions, so you can clear the challenge levels, please try by all means aim to Zentoi clear. Each, the accuracy rate of the element symbol because you are saved, you can also check efficiently the bad elements of the performance.