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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.
neutron mass, kg
9.11 x 10
1.67 x 10
1.67 x 10 mass, amu
-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
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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