TEST BANK FOR Engineering Materials Science By Milton Ohring
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2.1 (a) When two or more atoms of an element have different atomic masses, each is termed an
isotope.
(b) The atomic weights of the elements ordinarily are not integers because: (1) the atomic
masses of the atoms generally are not integers (except for
12
C), and (2) the atomic weight is
taken as the weighted average of the atomic masses of an atom's naturally occurring isotopes.
2.2 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.
2.3 (a) In order to determine the number of grams in one amu of material, appropriate manipulation
of the amu/atom, g/mol, and atom/mol relationships is all that is necessary, as
#g/amu =
èç æ
ø÷ ö 1 mol
6.023 x 1023 atoms ( 1 g/mol )
1 amu/atom
= 1.66 x 10-24 g/amu
(b) Since there are 453.6 g/lbm,
1 lb-mol = (453.6 g/lbm)(6.023 x 1023 atoms/g-mol)
= 2.73 x 1026 atoms/lb-mol
2.4 (a) Two important quantum-mechanical concepts associated with the Bohr model of the atom
are that electrons are particles moving in discrete orbitals, and electron energy is quantized into
shells.
(b) Two important refinements resulting from the wave-mechanical atomic model are that
electron position is described in terms of a probability distribution, and electron energy is
quantized into both shells and subshells--each electron is characterized by four quantum
numbers.
[Solved] TEST BANK FOR Engineering Materials Science By Milton Ohring
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- Submitted On 14 Nov, 2021 04:44:48
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