Class 12 Chemistry The Solid State Three dimensional close packing from two dimensional square

Three dimensional close packing from two dimensional square close-packed layers:

  • The second layer is placed over the first layer in such a way that the spheres of the upper layer are exactly above those of the first layer.
  • In this arrangement of spheres, both the layers are perfectly aligned horizontally as well as vertically.
  • Let the first row be ‘A’ type row, and the second row be ‘B’ type row.
  • Thus this lattice has AAA.... type pattern.
  • The lattice therefore generated is the simple cubic lattice, and its unit cell is the primitive cubic unit cell.

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