a) calculate the packing efficiency of a body-centred cubic structure. (show working) b) the density of Co, Ni and Cu are all 8.9 g cm^-3 while the density of Fe is 7.8) g cm^-3. Explain why the density of Co, Ni sand Cu are the same and the density of Fe is lower.   c) KBr adopts the rock salt structure, which unit cell length a= 6.5944 Å. Calculate the density of KBr (show working)

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Crystallography

Crystallography is the category of science that focuses on the atomic and molecular arrangements with their bonding constituting the crystal structure. It is derived experimentally and originated in the year 1912. It is a combination of two words; those are crystal, meaning a cold drop, and graph, meaning writing.