What would be the number of tetrahedral and octahedral voids,In a face centred cubic unit cell (i.e., ccp structure) 4 atoms/ions are present?

 there is 8 tetrahedral voids and 4 octhahedral  voids in a face centred cubic unit cell.
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Copper crystallises in a face-centered cubic lattice with a unit cell length of 361 pm. What is the radius of copper atom in pm?

  • 128

  • 157

  • 181

  • 108


A.

128

In case of the face-centred cubic lattice,
radius = 2a4
therefore, Radius of the copper atom (fcc lattice)
=2 x 3614 = 128 pm


A compound is formed by elements A and B. This crystallises in the cubic structure when atoms A are at the corners of the cube and atoms B are at the centre of the body. The simplest formula of the compound is:
  • AB
  • AB2
  • A2B
  • AB4

A.

AB
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how many  the number of tetrahedral and octahedral voids are present in a cubic close packed structure of A spheres?

 In ccp structure of a sphere there is 2A tetrahedral voids and A octahedral voids.
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What type of point defect in a crystal of zinc sulphate?


Frenkel defect.
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