Through all the elements in the periodic table, you can understand the characteristics of each element one by one. The contents include the time when the element was discovered, the person, the occasion, as well as the current production process, the current application range, toxicity, mineral origin and other basic information.Through all the elements in the periodic table, one by one to know the characteristics of each element, the content covers the age, characters, occasions, and current production process, current application scope, toxicity, mineral origin and other basic information.