When two or more elements combine into compounds occur. The ratio by mass of the elements that are.The element is always constant. Whether to prepare compounds with any method.
When elements from two or more together as a compound. The mass of the element that is the element that is always constant. The compound was prepared in any way whatsoever.
When the elements from two kinds of up together as compounds. Mass ratio of elements are elements that are always constant. Whether the compound prepared by any means.