Lalo

CRISTALLINE STRUCTURE

1.- What is the difference between atomic structure and crystal structure?
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2.- If the atomic radius ofaluminum is .143 nm, calculate the volume of its unit cell in cubic meters.
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3.- Determine the radius of a palladium atom, given that Pd hasan FCC crystal structure.
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4.- Calculate the radius of a palladium atom, given that Pd has an BCC crystal structure.
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5.- For theHCP crystal structure, show that the ideal c/a ratio is 1.633.
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6.- Show that atomic packing factor for HCP is 0.74
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7.- Iron has aBCC crystal structure, an atomic radius of 0.124nm, and an atomic weight of 55.85 g/mal. Compute and compare its theoretical density with theexperimental value found inside the front cover.
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8.- Some hypothetical metal has the simple cubic crystal structure shown in figurebelow. If its atomic weight is 74.5 g/mol and the atomic radius is 0.145 nm
Compute its destiny.
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9.- Titanium has an HCP crystal structureand a density of 4.51 g/ cm3. (A) What is the volume of its unit cell in cubic meters? , (B) If the c/a ratio is 1.58, compute the values of cand a.
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10.- Using atomic weight, crystal structure, and atomic radius data tabulated in the attached table, compute the theoreticaldensities of aluminum, nickel, magnesium, and tungsten, and then compare these values with the measured. The c/a ratio for magnesium is 1.624.
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