the development of the atomic theory
The Greek concept of atomos: the atomAround 440 BC leucippus of Miletus originated the atom concept. He and his pupil, Democritus of abdera refined it for future use. Their atomic idea has five major points. All original writings of leucippus and Democritus are lost. The only sources we have for there atomistic ideas are inquotations from other writers. Democritus was known as the "laughing philosopher" because he enjoyed life so much. At this time Greek philosophy was about 150 years old, emerging in the sixth century bc, centered in the city of miletus on the ionian coast in Asia minor, which is now turkey. The work of leucippus and Democritus was further developed by epicures (341-270 BC) of Samos. He made ideas more generally known. Aristotle also quotes both of them in arguing against their ideas. Most of what we know about leucippus and Democritus was found in a poem entitled "de rerum natura" (on the nature of things) written by Lucretius (95-55 BC). This poem was lost for over a thousand years and was discovered in 1417. These are the basic points of their theory.#1 - all matter is composed of atoms, which are bits of matter to small to be seen. These cannot be split any smaller. " The atomists hold that spli
Raymer-Cantham, Chemistry addison-wesley publishers. #2- there is an empty space between atoms. So the movement within the atoms is allowed by a space so atoms can move from place to place. Through Thomson's discovery of the electron, Robert milikan (1868-1953) discovered how to determine the charge of an electron. He also discovered that the number of protons makes up the atomic number. If there is a space outside there cannot be a space inside, which would cause to disintegrate. And that the number of protons and neutrons makes up the atomic mass. He knew he could move them with a magnetic field. He created an equation for this fall. Principal quantum number- the integer used to identify each energy level. #4- when elements react, their atoms combine in simple whole number ratios. Atoms are very hard so they cannot be divided.
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