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  • Number of atoms in a unit cell:
    • 4 atomscompletely inside cell
    • Each of the 8 atoms on corners are shared among cells

 count as 1 atom inside cell

  • Each of the 6 atoms on the faces are shared among 2

cells  count as 3 atomsinside cell

    • Total number inside the cell = 4 + 1 + 3 = 8
  • Cell volume:

(.543 nm)3 = 1.6 x 10-22 cm3

  • Density of silicon atoms

= (8 atoms) / (cell volume) = 5 x 1022 atoms/cm3

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15y ago

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