With reference to crystal structure, what is meant by coordinatio
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    The Solid State

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    231. With reference to crystal structure, what is meant by coordination number? 

    The coordination number of an atom, ion or molecule is the number of constituent particles which touch that particular atom, atom or molecule.

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    232. What is the coordination number of atoms
    (i) in a cubic close packed structure?
    (ii) in a body-centred cubic structure?
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    233. Calculate the efficiency (percentage of volume occupied and unoccupied) of packing in case of a metal crystal for simple cubic.
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    234.

     (a) Determine the type of cubic lattice to which a given crystal belongs if it has edge length of 290 pm and density is 7.80 g cm–3. (Molecular mass.= 56 g mol–1)

    (b) Why does zinc oxide exhibit enhanced electrical conductivity on heating?

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    235. The compound CuCl has the ZnS (Cubic) structure. Its density is 3.04 g cm–3. What is the length of the edge of unit cell? (At. mass of Cu = 63.5, CI = 35.5) 
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    236. Potassium crystallises in a simple cubic unit cell. It has an atomic mass of 209 and its density is 91.5 g m–3. What is the edge length of its unit cell? 
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    237. An element crystallises in fcc structure with an edge of 200 pm. Calculate density if 200 g of this element contains 24 x 1023 atoms. 
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    238. The nearest neighbour Ag atoms in the silver crystal are 2.87 x 10–10 m apart. What is the density of silver? Silver crystallises in fcc form.
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    239. The cell edge of a fcc element of atomic mass 108 is 409 pm. Calculate its density.
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    240. An element ‘A’ of atomic mass 100 having bcc structure has unit cell edge of 400 pm. Calculate the density of ‘A’ and the number of unit cells for 10 g of ‘A’.
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