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# C what comparison can be made of the materials in

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Unformatted text preview: cell includes one atom, or ½ Na and ½ Cl. Hence, the two densities are ρ Na = ρCl = 11 = 2.28 × 10 28 m −3 . 3 2 (d ) (d) Na has a mass of 22.989 amu and Cl has a mass of 35.453 amu. The atomic mass unit is 1.6605 × 10- 27 kg, so that the mass density of NaCl is ρ= 22.989 + 35.453 1.6605 × 10 −27 = 2.21 × 10 3 kg / m 3 3 2 d or 2.21 gms/cm3. 1.12 (a) A material is composed of two types of atoms. Atom A has an effective radius of 0.22 nm and atom B has an effective radius of 0.18 nm. The lattice is bcc with atoms A at the corners and atom B in the center. Determine the lattice constant (the cube edge) and the volume density of A atoms and B atoms. (b) Repeat part (a) with B atoms at the corners and A atom in the center. (c) What comparison can be made of the materials in parts (a) and (b). (a) The nearest neighbor spacing is now 0.4 nm and this is the distance between the A atom and t...
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