A compound formed by elements x and y has cubic unit cells in which x atoms are at the corner of the cube and y atoms are at the face centres. what is formula of the compund ?
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as atoms in a cubic unit cell is 1,x=1.No. of atoms in face centered unit cell is 3,y=3. Therefore formula will b xy3
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Answer:
Atoms of Y occupy the corners of the cube.
=> Number of Y atoms in a unit cell = 8 x 1/8 = 1
The atom of X occupies the body centre.
=> Number of Y atoms in a unit cell = 1
Therefore, the ratio of the number of X atoms to the number of Y atoms;
X : Y = 1 : 1
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