"Electron" Essays and Research Papers

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The Discovery Of The Electron The electron was discovered in 1895 by J.J. Thomson in the form of cathode rays, and was the first elementary particle to be identified. The electron is the lightest known particle which possesses an electric charge. Its rest mass is Me <approximately equal> 9.1 x 10 -28 g, about 1/1836 of the mass of the proton or neutron. The charge of the electron is -e = -4.8 x 10^-10 esu <elec trostatic unit). The sign of the electron's charge is negative by convention, and...

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J.J. Thomson – Discovery of the Electron

Individual Assignment J.J. Thomson – Discovery of the electron Table of Contents Introduction 2 Biographical information 3 Background information 4 Experimental information 5 Impact 6 Conclusion 7 J.J. Thomson – Discovery of the electron Introduction The discovery of the electron is affirmative and justly credited to the English physicist Sir Joseph John Thomson (Weinberg, 2003). He had found and identified the electron in Cavendish Laboratory, Cambridge in 1897. From many...

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Atom and Proton Electron

chemical behavior. A. B. C. D. E. proton, neutron, electron proton, electron, neutron neutron, electron, proton proton, photon, neutron none of the above 2. The symbol 63 Cu represents an isotope of the element copper. Give the following values: atomic 29 number, mass number, number of neutrons, number of electrons, and number of protons. A. B. C. D. E. atomic # 63 63 29 29 29 mass number 29 29 63 63 92 # of neutrons 34 63 29 34 63 # of electrons 63 63 63 29 29 # of protons 63 29 63 29 29 3....

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Electrons: Electric Charge

The electron is a fundamental subatomic particle that carries a negative electric charge. It is a spin-½ lepton that participates in electromagnetic interactions, and its mass is less than one thousandth of that of the smallest atom. Its electric charge is defined by convention to be negative, with a value of &#8722;1 in atomic units. Together with atomic nuclei, electrons make up atoms; their interaction with adjacent nuclei is the main cause of chemical bonding. The name "electron" comes from...

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Electron and Potential Difference

cross section with a radius of 1.25 mm. (a) If the wire carries a current of 3.70 A, find the drift speed of the electrons in this wire. 3. An aluminum wire having a cross-sectional area equal to 4.00 10–6 m2 carries a current of 5.00 A. The density of aluminum is 2.70 g/cm3. Assume each aluminum atom supplies one conduction electron per atom. Find the drift speed of the electrons in the wire. 12. A lightbulb has a resistance of 240 when operating with a potential difference of 120 V across...

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The Electron of Atomic Physics

Sir J.J.THOMSOM is to physics what electron is to an atom. He charged the world of physics with his discoveries and gave momentum to atomic physics. Physics is what today because of this British scientist who is regarded as the greatest experimental physicists of this century. A bookseller’s son, Thomsom studied at the Owens College and later at the Manchester University. He wanted to become an engineer, but his father’s death in 1872 forced him to study Mathematics, Physics and Chemistry as he...

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Deflection of an Electron Beam by a Magentic Field

Deflection of an Electron Beam by an Electric Field Nicole N Lab Problem 1.4 – February 3, 2011 Problem Statement: We were asked to test the design of an electron microscope to determine how a change in the electric field affects the position of the beam spot. The goal is to find out how different variables, such as charge of the deflection plates providing a vertical electric field and initial velocity of the electron beam will affect the amount of deflection the electron beam experiences...

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Electron Microscope

An electron microscope is a type of microscope that produces an electronically-magnified image of a specimen for detailed observation. The electron microscope (EM) uses a particle beam of electrons to illuminate the specimen and create a magnified image of it. The microscope has a greater resolving power than a light-powered optical microscope, because it uses electrons that have wavelengths about 100,000 times shorter than visible light (photons), and can achieve magnifications of up to 1,000,000x...

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Electron Microscopy

Electron Microscopy The electron microscope is a very powerful microscope which can see things that normal microscopes cannot. There are 2 types of electron microscope: the transmission electron microscope and the scanning electron microscope. The sample must be in a vacuum so that no air bubbles are on the produced image and also because the electrons are absorbed by the molecules in the air, this means that the electron microscope cannot be used to look at living cells. The tissue is soaked...

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Electrons in Atoms Outline

Chapter 5: Electrons In Atoms A. Models of the atom i. The Development of Atomic Models Protons and neutrons make up a nucleus surrounded by electrons Rutherford’s model or theory ( figured electrons move around the nucleus) His theory didn’t explain why metals or compounds of medals give off characteristics of colors when heated. Also didn’t explain why the atomic model could not explain the chemical properties of elements ii. The Bhor Model Bohr proposed that an electron is found in specific...

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