Atomic radius, crystal structure, electronegativity, and the most common valence
ID: 538472 • Letter: A
Question
Atomic radius, crystal structure, electronegativity, and the most common valence are given in the following table for several elements; for those that are nonmetals, only atomic radii are indicated.
Which of these elements would you expect to form the following with copper?
(a) A substitutional solid solution having complete solubility
(b) A substitutional solid solution of incomplete solubility
(c) An interstitial solid solution
Atomic Radius Crystal Electro- Element (nm) Structure negativity Valence FCC 2 0.1278 0.071 0.046 0.060 0.1445 0.1431 0.1253 0.1249 0.1241 0.1246 0.1376 0.1387 0.1332 FCC FCC HCP BCC BCC FCC FCC FCC HCP 1.9 Al 1.8 1.6 1.8 1.8 2 Pd +2Explanation / Answer
(a) A substitutional solid solution having complete solubility
a) according to the given table we can say that Ni, Pt and Pd solid solution having complete solubility because they satisfies the conditions necessary to form substitutional solid solution having complete solubility.
(b) A substitutional solid solution of incomplete solubility
b) according to the given table we can say that Ag, Al, Co, Cr, Fe and Zn solid solution of incomplete solubility of incomplete solubility. They all have atomic radii which are very different than Cu (greater then 15%), or different crystal structure (BCC or HCP) or differ in their valence.
(c) An interstitial solid solution
c) Hydrogen, cabon and oxygen solid solution form interstitial solid solutions. These all have atomic radii much smaller then radii of Cu.
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