Which of these are true??there can be more then one answer?

Question

a) A simple cubic unit cell contains a total of four atoms

b) A body-centered cubic unit cell contains a total of two atoms

c) A face-centeed cubic unit cell contains a total of six atoms

d) In a cubic close-packed structure each sphere has twenty four nearest neighbors

Answer 1

a) A simple cubic unit cell contains a total of four atoms
Wrong! only one atom
b) A body-centered cubic unit cell contains a total of two atoms
True!
c) A face-centeed cubic unit cell contains a total of six atoms
Wrong! four atoms.
d) In a cubic close-packed structure each sphere has twenty four nearest neighbors
Wrong! It depends on structure, and for example, atom in a simple cubic unit cell only has 6 nearest neighbors.

Your reference:
http://en.wikipedia.org/wiki/Cubic_%28crystal_system%29

Answer 2

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