1. Many substances crystallize in a cubic structure. The unit cell for such crystals is a cube having an edge with a length equal to do -Face diagonal a. What is the length, in terms of do. of the face diagonal, which runs diagonally across one face of the cube? (Hint: Use the Pythagorean theorem.) b. What is the length, again in terms of do. of the cube diagonal, which runs from one corner, through the center of the cube, to the opposite corner? (Hint: Make a right triangle having a face diagonal and an edge of the cube as its sides, with the hypotenuse equal to the cube diagonal, then use the Pythagorean theorem again.)

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1. Many substances crystallize in a cubic structure. The unit cell for such crystals is a cube having an edge
with a length equal to do.
-Face diagonal
a. What is the length, in terms of do, of the face diagonal, which runs diagonally across one face of
the cube? (Hint: Use the Pythagorean theorem.)
b. What is the length, again in terms of do. of the cube diagonal, which runs from one corner, through
the center of the cube, to the opposite corner? (Hint: Make a right triangle having a face diagonal
and an edge of the cube as its sides, with the hypotenuse equal to the cube diagonal, then use the
Pythagorean theorem again.)
2. In an FCC structure, the centers of the atoms are found on the corners of the cubic unit cell and at the
center of each face. The unit cell has an edge whose length is the distance from the center of one corner
atom to the center of another corner atom on the same edge. The atoms on the diagonal of any face are
touching. One of the faces of the unit cell is shown here:
88
a. Show the distance do on the sketch. Draw in the boundaries of the unit cell.
b. What is the relationship between the length of the face diagonal and the radius of the atoms, r?
c. How is the radius of the atoms related to do?
Face diagonal
Transcribed Image Text:1. Many substances crystallize in a cubic structure. The unit cell for such crystals is a cube having an edge with a length equal to do. -Face diagonal a. What is the length, in terms of do, of the face diagonal, which runs diagonally across one face of the cube? (Hint: Use the Pythagorean theorem.) b. What is the length, again in terms of do. of the cube diagonal, which runs from one corner, through the center of the cube, to the opposite corner? (Hint: Make a right triangle having a face diagonal and an edge of the cube as its sides, with the hypotenuse equal to the cube diagonal, then use the Pythagorean theorem again.) 2. In an FCC structure, the centers of the atoms are found on the corners of the cubic unit cell and at the center of each face. The unit cell has an edge whose length is the distance from the center of one corner atom to the center of another corner atom on the same edge. The atoms on the diagonal of any face are touching. One of the faces of the unit cell is shown here: 88 a. Show the distance do on the sketch. Draw in the boundaries of the unit cell. b. What is the relationship between the length of the face diagonal and the radius of the atoms, r? c. How is the radius of the atoms related to do? Face diagonal
2. In an FCC structure, the centers of the atoms are found on the corners of the cubic unit cell and at the
center of each face. The unit cell has an edge whose length is the distance from the center of one corner
atom to the center of another corner atom on the same edge. The atoms on the diagonal of any face are
touching. One of the faces of the unit cell is shown here:
88
2/6/24, 2:38 PM
a. Show the distance do on the sketch. Draw in the boundaries of the unit cell.
b. What is the relationship between the length of the face diagonal and the radius of the atoms, r?
c. How is the radius of the atoms related to do?
https://ng.cengage.com/static/nb/ui/evo/index.html?elSBN=9780357857519&id=1775621999&nbld=3442981&snapshotld-3442981&dockAppUid=101&
Face diagonal
Print Preview
d. Platinum metal crystals have an FCC structure. The unit cell edge in platinum is 0.3932 nm long.
What is the radius of a platinum atom, ?
x do
2/3
Transcribed Image Text:2. In an FCC structure, the centers of the atoms are found on the corners of the cubic unit cell and at the center of each face. The unit cell has an edge whose length is the distance from the center of one corner atom to the center of another corner atom on the same edge. The atoms on the diagonal of any face are touching. One of the faces of the unit cell is shown here: 88 2/6/24, 2:38 PM a. Show the distance do on the sketch. Draw in the boundaries of the unit cell. b. What is the relationship between the length of the face diagonal and the radius of the atoms, r? c. How is the radius of the atoms related to do? https://ng.cengage.com/static/nb/ui/evo/index.html?elSBN=9780357857519&id=1775621999&nbld=3442981&snapshotld-3442981&dockAppUid=101& Face diagonal Print Preview d. Platinum metal crystals have an FCC structure. The unit cell edge in platinum is 0.3932 nm long. What is the radius of a platinum atom, ? x do 2/3
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