Choose an acceptable structure for RbCl(s). Assume that "radius ratio rules" are obeyed and that the ionic radii of Rb+ and Cl− are 148 pm and 181 pm, respectively. Rb+ ions occupy half of the octahedral sites in a face-centred cubic lattice of Cl− ions. Rb+ ions occupy all of the tetrahedral sites in a face-centred cubic lattice of Cl− ions. Rb+ ions occupy all of the cubic sites in a simple cubic lattice of Cl− ions. Rb+ ions occupy half of the tetrahedral sites in a face-centred cubic lattice of Cl− ions. Rb+ ions occupy all of the octahedral sites in a face-centred cubic lattice of Cl− ions.

Chemistry
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Chapter1: Chemical Foundations
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Choose an acceptable structure for RbCl(s). Assume that "radius ratio rules" are obeyed and that the ionic radii of Rb+ and Cl− are 148 pm and 181 pm, respectively. Rb+ ions occupy half of the octahedral sites in a face-centred cubic lattice of Cl− ions. Rb+ ions occupy all of the tetrahedral sites in a face-centred cubic lattice of Cl− ions. Rb+ ions occupy all of the cubic sites in a simple cubic lattice of Cl− ions. Rb+ ions occupy half of the tetrahedral sites in a face-centred cubic lattice of Cl− ions. Rb+ ions occupy all of the octahedral sites in a face-centred cubic lattice of Cl− ions.
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Given :

 Ionic radii of Rb+ = 148 pm 

Ionic radii of Cl-  = 181 pm

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