Can you explain please? 0 smartwork.wwnorton.com righam Young U Provo, General C

Question

Can you explain please? 0 smartwork.wwnorton.com righam Young U Provo, General College Chemistry II, Chem 06, Fall 2017, Prof. Harrison RTWORK 3.0 wwN1 2054 Hw37-SALTS Periodic Table Ebook uestion 3 of 12 (1 point) Can CaCl2 have the rock salt crystal structure? Choose the answer that best explains why or why not. o Yes, the sizes of the ions are compatible, and the charge can be handled as long as only O No, aithough the sizes of the ions are compatible, the 2+ charge on calcium prevents the half the octahedral holes are filled formation of the structure. No, CaC2 cannot have the rock salt crystal structure because it has 2:1 stoichiometry unlike rock sal's 1:1 stoichiometry O Yes, CaCl2 can have the rock salt crystal structure because, like rock salt, it is ionic. No, the relative size of the Ca and the Cr will not allow adoption of a rock salt crystal structure. Hint Check Answer View Solution Progress: 3 45 67 89 10 Exit Activity Activity Grade: 8 Points Possible Started: Wednesday, December 6, 2017, 07:12 AM

Explanation / Answer

The main criteria to form rock salt structure of a crystal is that it has to be AX type and the radius ratio value must belong in the range 0.414-0.732 ( exception may happen) and also anions (X) form the cation sub lattice with FCC structure. For CaCl2 although the radius ratio belong to the required range but it does not form rock salt like structure. This is because that it is not AX type rather it is AX2 type and also it is not FCC type. So in this question the option-3 is correct.

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