The+Atomic+Models(wolfe.defoe)

The Solid Indivisible Particle

The solid indivisible particle is the first theory of the atom. Democritus was the first to state this idea. He believed, as the title might tell you, that the atom was the smallest possible piece of matter and that it was indestructible. This was only a conceptual description though; he had no way to prove the atom's existence. 

Plum Pudding model The Plum Pudding Model is an atom model proposed by JJ Thomson, the scientist who discovered the electron. It is also known as the Chocolate Chip Cookie or Blueberry Muffin Model. Why is it related to dessert? You can imagine a plum pudding as the pudding itself being positively charged and the plums, dotting the pudding, are the negatively charged electrons. In contrast to today's atom which has a very dense and very small positively charged nucleus, Thomson's had a more dispersed positive charge. The plum pudding theory was mainly created explain why most atoms were neutral.





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The Planetary Model ** The main idea behind the planetary model is that negatively charged electrons made a circle around a positively charged nucleus, like the planets revolving around the sun. The only problem with this theory is that the electron would have to travel around the nucleus on a set elliptical course. We now know today that it is almost imposable to pinpoint the position of an electron, so this theory isn’t correct, though it makes sense.

Erwin Schrödinger's idea, based off of Bohr’s. He developed the probability function for the Hydrogen atom. The probability function basically describes a cloud-like region where the electron has a high probability to be found. It doesn’t say with any certainty, where the electron actually is located at any point of time, yet it can describe where it might likely be. The model based on this probability equation is described as the cloud model. The cloud model represents a sort of history of where the electron has probably been and where it is likely to be going. The red dot in the middle represents the nucleus while the red dot around the outside represents an instance of the electron. Imagine, as the electron moves it leaves a trace of where it was. This collection of traces quickly begins to resemble a cloud.
 * The Electron Cloud Model**



The Bohr Model <span style="font-family: Calibri; font-size: 11pt; line-height: 115%; mso-ansi-language: EN-US; mso-ascii-theme-font: minor-latin; mso-bidi-font-family: 'Times New Roman'; mso-bidi-language: AR-SA; mso-bidi-theme-font: minor-bidi; mso-fareast-font-family: Calibri; mso-fareast-language: EN-US; mso-fareast-theme-font: minor-latin; mso-hansi-theme-font: minor-latin; msoansilanguage: EN-US; msoasciithemefont: minor-latin; msobidifontfamily: 'Times New Roman'; msobidilanguage: AR-SA; msobidithemefont: minor-bidi; msofareastfontfamily: Calibri; msofareastlanguage: EN-US; msofareastthemefont: minor-latin; msohansithemefont: minor-latin;">The Bohr model is based off of the planetary model where electrons travel around the nucleus. The electrons travel in what we know as orbits. As an electron gets excited it has the capability to jump over entire orbit levels; when the electron returns to its natural place, photons are given off. A photon is an electromagnetic wave that we see as visible light. An Atom Giving Off a Photon



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