1. germanium (ge) has a diamond lattice with an atomic density of 4. 42x1022 atoms/cm3 , while aluminum (al) is a face-centered cubic with atomic density of 6. 02x1022atoms/cm3. a) calculate the lattice parameter a for ge and al. b) determine the number of atoms/cm2 on the (100), (110), and (111) surfaces for ge and al