Atoms are the basic structural unit of all engineering materials.|
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University of Nevada Las Vegas |
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MEG301 Structures and Properties of Solids |
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Department of Mechanical Engineering |
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Fall Semester 2000 |
Atomic Structure
Atoms are the basic structural unit of all engineering materials.
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ATOM |
Mass (g) |
Charge (c) |
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Proton |
1.673 * 10-24 |
+1.602 * 10-19 |
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Neutron |
1.675 * 10-24 |
0 |
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Electron |
9.109 * 10-28 |
-1.602 * 10-19 |
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Atomic Number: indicates the number of protons that are in its nucleus in an atom. In a neutral atom the atomic number is also equal to the number of electrons in its charge cloud.
Atomic Masses: the relative atomic mass of an element is the mass in grams of 6.023*1023 atoms (Avogadro's number NA) of that element.
One atomic mass unit (u) is defined as exactly one-twelfth of the mass of a carbon atom which as a mass of 12u.
Created by Dr. Wang
