Using the data in the table below, answer the questions listed below the table.

Question

Using the data in the table below, answer the questions listed below the table. Element Atomic Radius (nm) Crystal Structure Electronegativity Valence Cu 0.1278 FCC 1.9 +2 Ni 0.1246 FCC 1.8 +2 Cr 0.1249 BCC 1.6 +3 Co 0.1253 HCP 1.8 +2 Fe 0.1241 BCC 1.8 +2 Zn 0.1332 HCP 1.6 +2 Al 0.1431 FCC 1.5 +3 Au 0.144 FCC 2.4 +1 Ag 0.1445 FCC 1.9 +1 Pt 0.139 FCC 2.2 +2 a. Sterling silver is an alloy of 92.5% silver (Ag) and usually copper (Cu). Based on the table above, would you expect complete or partial solid solution for this mix of metals? Why? b. Copper is an alloying additive to aluminum. Based on the information above, would you expect complete or partial solid solution of copper in aluminum? Explain. c. Would you expect silver and gold to have complete solid solution or limited solid solution? Why? d. Would you expect platinum and aluminum to have complete solid solution or limited solid solution? Why? e. Would you expect chromium and cobalt to have complete solid solution or limited solid solution? Why?

Explanation / Answer

for complete solid solution , following condition should be satisfied. Similar atomic radii (15% or less difference) Same crystal structure Similar electronegativities Similar valency so For Ag and Cu, as valency are different , they will make partial solution, b) partial solution , due to difference in valency c) complete solution , as they satisfy all the conditions. d) incomplete , difference in valency e) partial , different lattice structure, valency

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