Kelsey Williams and Ashley Mahan. Atomic model project.
Created by ne11klwilliams on Oct 26, 2010
Last updated: 10/27/10 at 06:35 AM
Erwin Schrödinger made this model and he was born on August 12, 1887 in Vienna. The model was a visual model of the probable locations of electrons in an atom. The probability of finding an electron is higher in the denser regions of the cloud. Each electron shell is made up of a number of subshells. The number of subshells in the shell is the same number as the shell number. The subshells can be further divided into orbitals and each orbital is a distinct region of space that contains two electrons. He unsuccessfully looked at electrons as "wave packets." The nucleus contains neutrons and protons. James Chadwick confirms the existence of neutrons, which have no charge. Atomic nuclei contain neutrons and positively charged protons. What drives the uncertainty in the electron cloud model remains one of the great unsolved mysteries of physics.
http://www.universetoday.com/38282/electron-cloud-model/
He was born in Copenhagen on October 7, 1885. The electrons have quantized energy levels and could only have certain discrete orbits with discrete energy levels. Bohr first conducted experiments under J. J. Thomson. In this model the rotons and neutrons orbit around, which was the first for this. It violated the Heisenberg Uncertainty Principle because it considers electrons to have both a known radius and orbit. Provides an incorrect value for the ground state orbital angular momentum. The first assumption concerning the electrons in fixed circular orbits violates the laws of classical mechanical physics.
http://www.regentsprep.org/regents/physics/phys05/catomodel/bohr.htm
Was born in Spring Grove, New Zealand on August 30 1871. He invented the name proton for the nucleas of the atom. He found that an atom has a small, dense, positively charged nucleus and that electrons move around the nucleus. Bombarded gold foil with alpha particles. A source that undergoes alphya decay is placed in a lead box with a small hole in it. Any of the alpha particles that hit the box are stopped by the box. Only those that pass through the opening are allowed to escape, and they follow a straight line to the gold foil. It had electrons and protons and the electrons orbited around the protons. There were problems describing the atom in the beginning because the electrons do not orbit. The electrons were in the outside and the protons were in the middle and then neutrons were not discovered until the Bohr model.
http://www.rsc.org/chemsoc/timeline//pages/1911.html
Joseph John Thomson was born in Cheetham Hill on December 18, 1856. He enrolled at Owens College, Manchester, in 1870, and in 1876 entered Trinity College, Cambridge as a minor scholar. He was Cavendish Professor of Experimental Physics at Cambridge, where he succeeded Lord Rayleigh, from 1884 to 1918 and Honorary Professor of Physics, Cambridge and Royal Institution, London. Thomson studied the nature of electric discharge in a high-vaccum cathode ray tube. The model had a negatively charged particle, which was the electron. It also had a sphere that had a positive charge throughout. Electrons were embedded in a sphere of positive electrical charge. The problem with the model came from experiments that showed that atoms have nuclei.
http://www.suite101.com/content/early-theories-of-atomic-structure-a45685#ixzz1362WsWMs
Born on September 6, 1766 in Eagelsfield, Cumbria in England. He was a British chemist and physicist. This was the first model that was created.The atoms were tiny, indivisible, indestructible particles and that each one had a certain mass, size, and chemical behavior that was determined by what kind of element they were. One problem with his atomic theory was that it claimed that all matter is composed of tiny indivisible atoms. The model didn't describe protons, electrons, and neutrons because he didn't know they existed at that time. He is now called the father of modern atomic theory for his efforts.
http://dl.clackamas.edu/ch104-04/dalton's.htm
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