lonic Compounds 4 Fill in the following table. Crystal Lattice Types for lonic C

Question

lonic Compounds 4 Fill in the following table. Crystal Lattice Types for lonic Compounds Location Arrangement of Negative lons of Positive lon:s Relative Size of Hole* Coordination Number Cesium Chloride Sodium Chloride Zinc Sulfide *Occupied by positive ions 5/For an ionic compound with the chemical formula, MX, what range of values of r./r. is theoretically desirable in order for the compound to assume the (a)l CsCI structure? (b) NaCl structure? (c) znS structure? 6 (a) In which structure does an ion form the greatest number of bonds? How many bonds is the ion forming? (b) In which structure does an ion form the fewest number of bonds? How many bonds is the ion forming? 82 Chemistry 141: General Chemistry I Lab Manual Cuyamaca College

Explanation / Answer

Q4)

CsCl - negative ions form cubic lattice - positive ions occupy cubic void - size of void =0.732 of negative ions.

coordination number = 8

NaCl - negative ions form face centred cubic lattice - positive ions occupy octahedral void - size of void =0.414 of negative ions.

coordination number = 6

zinc sulfide

negative ions form face cenredcubic lattice - positive ions occupy half of tetrahedral void - size of void =0.225 of negative ions.

coordination number = 4

Q5)

The range of radius ratio r+/r- desirable for

a) CsCl equal to or greater than 0.732

b) NaCl equal to or greater than 0.414 and less than 0.732

c) AnS equal to or greater than 0.225 and less than 0.414

Q6)

CsCl has highest coordination number which means one ion forms 8 bonds (coordination number 8) and

ZnS has loest coordination number of 4 which means four bonds per ion.

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