Using Eq. (1) and Eq. (2), show that K(r.)*for an ionic solid. K=-2, a20 = + 20 Eq. (1) ) an? u (-30) Eq.(2) K is the bulk modulus, 1 = atomic volume. Note also that wij is not the same as U! Using Eq. (1) and Eq. (2), show that K(r.)*for an ionic solid. K=-2, a20 = + 20 Eq. (1) ) an? u (-30) Eq.(2) K is the bulk modulus, 1 = atomic volume. Note also that wij is not the same as U