Calculate the atomic concentration (in cm¯³) and density (in g/cm³) of the following, using their lattice constants, atomic weights, and Avogadro's number: (a) Si (lattice constant = 5.43 Å; atomic weight = 28.1) (b) Ge (lattice constant = 5.66 Ä; atomic weight = (c) GaAs (lattice const. = 5.65 Å; atomic weightGa = 69.7; atomic weight As = 74.9) 72.6) %3D %3D %3D

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