Solid StateHard

Question

The ionic radii of Cs and Cl are 0.165 nm and 0.181nm respectively. Their atomic weights are 133 and 35.5. Then,

Options

A.the lattice parameter (a) is 0.4 nm
B.the lattice parameter can not be determined from this data
C.the density of CsCI is 4.37 × 103 kg/m3
D.the CsCI structure has a fcc structure on the basis of given information.

Solution

For CsCl type, 2(r+ + r-) = a√3
So   a = (0.165 + 0.181) = 0.4 mm
Density = = 4.37 × 103 kg/m3.

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