Chris+Russo

Hello
 * 1) History of the Atom.

John Dalton (September 6 1766 - July 27 1844)

John Dalton was a English Chemist, meterologist, and a physicist. He is most known for his study in atomic theroy. He understood that there are basic substances, known as elements. Such as oxygen, hydrogen, sulfur, and carbon. He also knew that they couldn't be broken down by chemical means into simpler substances.What no one knew, and he wanted to find out. is what made them different from each other. Dalton thought it had somthing to do with atoms. However, there was no way to weigh or measure an atom then or now. Dalton knew that elements always combine in fixed amounts with the same ratio of weight to one another This is know as "The Law of Definite Proprotions". Then that led him to a different thought. Dalton knew that if he weighed equal amounts of elements that he could assume that they had equal amounts of atoms. Then he could get the ratio of their weights. This wouldn't give him the exact weight of an atom, but he would know it compared to others. He correctly guessed that hydrogen was the lighest element. He used that as a standard and all othrer elements would be multiples of that lightest one.