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[" Q20.(a) An element crystallizes in fc...

[" Q20.(a) An element crystallizes in fce lattice with cell edge of "250" pm.Calculate the density "],[" if "300g" of this element contain "2times10^(24)" atoms."],[" (b)Give an example each of a molecular solid and an ionic solid."],[" (c) Which stoichiometric defect does not change the density of the crystal? "]

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