Aluminum metal crystallizes in a cubic close-packed structure [face-centered cubic cell, Figure 12.14(a)]. (a) How many aluminum

Question:

Aluminum metal crystallizes in a cubic close-packed structure [face-centered cubic cell, Figure 12.14(a)].
(a) How many aluminum atoms are in a unit cell?
(b) What is the coordination number of each aluminum atom?
(c) Estimate the length of the unit cell edge, a, from the atomic radius of aluminum (1.43 Å).
(d) Calculate the density of aluminum metal?