4.7 Which of the following systems (i.e., pair of metals) would you expect to exhibit complete solid solubility? Hint: to be completely soluble, the two elements must satisfy all the four HumeRothery rules. For the valence, the most common valences of the two elements must be the same for complete solubility. Show me your reasoning procedures. Only work on b, d and e. Atomic radius in nm for the elements: Mg:0.160;Zn:0.133;Ag:0.144;Au:0.144;Pb:0.175; Pt:0.139. (b) MgZn (d) Ag-Au (e) PbPt 4.12 Derive the following equations Equation 4.7a. C1=C1A1+C2A2C1A1100