QUESTION 3 (a) Table 1 lists the crystal structures and atomic radii of a few elements. Suggest two pairs of elements that are likely to form binary isomorphous alloy. Explain your answer. Table 1: Crystal structure and atomic radii of several metallic elements Hypothetical Crystal structure Atomic radius / nm elements S FCC 0.144 0.143 BCC 0.231 BCC 0.137 G FCC 0.144 M BCC 0.136 * FCC = Face-centered cubic; BCC = Body-centered cubic [4 marks]