재료과학과공학 솔루션 (9판)

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ch02.pdf
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ch06.pdf
ch07.pdf
ch08.pdf
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ch11.pdf
ch12.pdf
ch13.pdf
ch14.pdf
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CHAPTER 2
ATOMIC STRUCTURE AND INTERATOMIC BONDING PROBLEM SOLUTIONS

Fundamental Concepts Electrons in Atoms

2.1 Cite the difference between atomic mass and atomic weight.

Solution
Atomic mass is the mass of an individual atom, whereas atomic weight is the average (weighted) of the atomic masses of an atom's naturally occurring isotopes.

2.2 Chromium has four naturally-occurring isotopes: 4.34% of 50Cr, with an atomic weight of 49.9460 amu, 83.79% of 52Cr, with an atomic weight of 51.9405 amu, 9.50% of 53Cr, with an atomic weight of 52.9407 amu, and 2.37% of 54Cr, with an atomic weight of 53.9389 amu. On the basis of these data, confirm that the average atomic weight of Cr is 51.9963 amu.

Solution
The average atomic weight of silicon
(A Cr)
is computed by adding fraction-of￾occurrence/atomic weight products for the three isotopes. Thus

2.3 (a) How many grams are there in one amu of a material?

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ch12.pdf
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