(1) Which of the following elements would have the greatest tendency to form an
ID: 979369 • Letter: #
Question
(1) Which of the following elements would have the greatest tendency to form an interstitial solid solution? Briefly explain your answer.
Polonium, Sodium, Platinum, Zinc, Diamod, Cesium CHloride, Sodium Chloride, Sphalerite, and Wurtzite.
(2) The Ionic radius of Fe2+ ion is the same as that of Zn2+ ion. Because of this similarity, as well as having the same charge, Fe2+ ions often substitue freely for some of the Zn2+ ions in sphalerite and wurtzite, forming a substitutional solid solution. Would the density of such a solid solution be greater or less than the theoretical density of ZnS? Briefly explain your answer.
Explanation / Answer
1) NaCl has the greatest tendency to form an interstitial solid solution due to it´s crystal structure (face-centered cubic) which has the largest space of the given elements, allowing entry of a solute more easily.
2) A substitutional solid solution of ZnS would have a lower density than the theoretical because Fe+2 has a smaller molecular weight than Zn+2.
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