Ch.12 - Solids and Solid-State Materials
Chapter 12, Problem 7
Examine diagrams for the electron population of the composite s–d band for three metals in question 6. Which metal has the highest melting point? (LO 12.7) (a) Metal 1 (b) Metal 2 (c) Metal 3
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Related Practice
Textbook Question
Diffraction of X rays with l = 131.5 pm occurred at an
angle of 25.5 degrees by a crystal of aluminum. Assuming
first-order diffraction, what is the interplanar spacing in
aluminum? (LO 12.2)
(a) 76.4 pm (b) 183.1 pm
(c) 305.5 pm (d) 152.7 pm
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Textbook Question
Niobium oxide crystallizes in the following cubic unit cell:
What is the formula of niobium oxide, and what is the oxidation
state of niobium? (LO 12.5)
(a) NbO, Nb = +2 (b) Nb2O, Nb = +2
(c) NbO2, Nb = +4 (d) Nb2O3, Nb = +3
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Textbook Question
The following diagrams represent the electron population of
the composite s–d band for three metals—Ag, Mo, and Y:
Which diagram corresponds to which metal? (LO 12.7)
(a) Ag = 3, Mo = 1, Y = 2
(b) Ag = 2, Mo = 1, Y = 3
(c) Ag = 2, Mo = 3, Y = 1
(d) Ag = 1, Mo = 2, Y = 3
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Textbook Question
The following diagrams represent the electron population of
molecular orbitals for different substances. What diagram corresponds
to magnesium oxide, germanium, and tin? (LO 12.8)
(a) Diagram 1 = tin, diagram 2 = magnesium oxide,
diagram 3 = germanium
(b) Diagram 1 = germanium, diagram 2 = magnesium
oxide, diagram 3 = tin
(c) Diagram 1 = germanium, diagram 2 = tin, diagram
3 = magnesium oxide
(d) Diagram 1 = magnesium oxide, diagram 2 = tin,
diagram 3 = germanium
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Textbook Question
The molecular orbital diagram of a doped semiconductor is
shown below. If the semiconductor is silicon, does the diagram
represent n-type or p-type doping and which of the
following elements could be dopant? (LO 12.9)
(a) n-type, As (b) n-type, Ga
(c) p-type, As (d) p-type, Ga
528
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Textbook Question
If the band-gap energy of a gallium phosphide (GaP) semiconductor
is 222 kJ/mol, calculate the wavelength of light
emitted in a GaP light-emitting diode (LED). (LO 12.11)
(a) 186 nm (b) 245 nm
(c) 539 nm (d) 854 nm
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