lecture2

60 x 10 31 coulombs so m 911 x 10 kg b particles are

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Unformatted text preview: 0 -31 coulombs, so m = 9.11 x 10 kg b particles are high energy electrons - alpha particles a particles are 7300 times the mass and have +2 charge gamma rays + beta particles relative to an electron g rays are high-energy electromagnetic radiation Plum pudding model - atoms are positive stuff with negative electrons scattered throughout Ernest Rutherford used a particles to probe the atom. He determined that most of the mas was concentrated in a nucleus 1/10,000 - 1/100,000 the diameter of the atom. 2.5 The Modern View of Atomic Structure: An Introduction Nuclei are made up of protons and neutrons. The nucleus contains most of the mass and all of the positive charge of the atom. Electrons surround the nucleus and make up the volume of the atom. particle electron proton neutron mass, kg 9.11 x 10 1.67 x 10 1.67 x 10 mass, amu -31 -27 -27 5.47 x 10 mass number -4 0 1.0073 1 1.0087 1 2-2 charge, coul. -19 -1.60 x 10 -19 +1.60 x 10 0 relative charge -1 +1 0 Chapter 2 Atoms, Molecules, and Ions James Chadwick discovered the neutron; Mosely discovered atomic numbers. Atomic Number (Z) - number of pro...
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This note was uploaded on 04/05/2014 for the course CHEM 1211 taught by Professor Jackduff during the Spring '13 term at SPSU.

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