The Physics Of The Atomic Theory Essay

1474 Words Mar 31st, 2016 6 Pages
The Atomic Theory states that all matter is composed of discrete units called atoms. The Atomic Theory started in about 400 BCE with a scientist by the name of Democritus. Democritus proposed the idea of the existence of an ultimate particle. He called this particle atomos when he was describing it, because the particle was too small to cut. Next, we get to Leucippus. Leucippus was the man who founded atomism, which is a theoretical approach that states nature consists of two principles, which are atom and void. After Leucippus came Aristotle. Aristotle believed there were four elements. These elements were air, earth, fire, and water. The matter of the world is made from a few fundamental building blocks of nature. He thought that it didn’t matter how many times you wanted to cut a form of matter in half, because you would always get a smaller piece of that matter. Antoine Lavoisier then proposed the Law of Conservation of Mass, which states the atoms of an object cannot be created nor destroyed. In 1803, John Dalton proposed the Law of Multiple Proportions which ultimately led to the proposal of the Atomic Theory. Dalton also developed the concept of the mole, and recognized the existence of atoms and proposed a system of symbols to represent the atoms of different elements. One last thing that Dalton did was assign a relative atomic weight of one to hydrogen. In 1869, Dmitri Mendeleev proposed the periodic law and developed the first periodic table which was arranged…

Related Documents