Atomic Theory
In ancient Greek the word atom meant the smallest indivisible particle that could be conceived. The atom was thought of as indestructible; in fact, the Greek word for atom means "not divisible." Knowledge about the size and make up of the atom grew very slowly as scientific theory progressed. What we know/theorize about the atom now began with a core theory devised by Democrotus, a Greek philosopher who proposed that matter consisted of various types of tiny discrete particles and that the properties of matter were determined by the properties of these particles. This core theory was then modified and altered over years by Dalton, Thompson, Rutherford, Bhor, and Chadwick. The atoms original structure was simple, but as more and more research was done the atom became more complex and puzzling The five atomic theories of the past two centuries represent the sudden advancement of science in modern times. Beginning with a basic theory on the behavior of atoms to the current model, some changes have been made, and some ideas are still the same. Ancient Greek philosophers believed that everything was made up of invisible particles called atoms. Since then the theory of atoms did not progress until 18
When excited electrons jump up a level they give off light energy: however, they can never go down a level, energy can never be lost only gained. The answer to these questions came along with the work of Neils Bohr. A theory never becomes fact until all of the bugs are wiped out, if this is true then this atomic theory is well on its way to becoming the facts about atoms. Soon after the discovery of electrons the proton was discovered. The laws of classical physics work perfectly well on the scale of everyday objects, but on the tiny atomic scale, the laws of quantum mechanics apply. Next, if the center of an atom was composed of protons (+) and the electrons (-) orbited this positive core why didn't the electrons crash into the protons, causing an ultra violet catastrophe. Neils Bohr developed a theory known as the Bohr theory of the atom. All elements are composed of atoms, which are indivisible and Indestructible particles. These scientists did exactly what scientists are supposed to do: test, experiment, and answer questions. They called this new approach quantum mechanics (Quantum Theory), and they developed a mathematical basis for it in the 1920s. Danish physicist Neils Bohr used new knowledge about the radiation emitted from atoms to develop a model of the atom significantly different from Rutherford's model.
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