Question

Q	A
A-1	1/8
A-2	1
A-3	8r^3
A-4	2r
A-5	1.91
A-6	6

Q	A
B-1	1
B-2	2
B-3
B-4
B-5	2.94
B-6	8

Q	A
C-1	1/2
C-2	4
C-3
C-4
C-5	1.91
C-6	6

Q	A
E-1	Both the sphere and hexagonal will be 12
E-2	It will be
E-3	You can’t pack anything better than hexagonal and cubic

Q	A
F-1	¼ Na and 1 cubic, 6 ½ Cl, unit cell 1/8
F-2	Na ¼ (12) +1= 4 Na Cl ½ 96) + 1/8 (8)= 4 Cl
F-3	2d because it is its double
F-4	Ions of Na=6 , and ions of Cl=6

the first image is the question and the rest it is just information to help you to answer

Crystal Structure X-ray diffraction studies show that the edge length of the unit cell in crystalline sodium chloride is 5.638 A. Calculate the internuclear Na+-Cl distance. Calculate the density of crystalline sodium chloride. Compare your answer with the experimental value obtained from the Handbook of Chemistry and Physics.