If you only translate it literally, the above may not be necessary, but I think it may be like this if you are practical: the ultimate harm by chemical elements.

The so-called chemical composition of element refers to elements, and ingredients are often used as ingredients in formulas, and component means components and parts. If something is made up of several parts, it can be represented by component, and ultimate means final. Literally translated, this sentence is the ultimate harm caused by chemical elements.