試題詳解

84. Aluminum (Al) metal crystallizes in a face-centered cubic structure. The relationship between the radius r of an Al atom and the length of an edge E of the unit cell is________.
(A) r = 0.354E
(B) r = 0.433E
(C) r = 0.5E
(D) r = 2E
(E) r = 4E