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. 6. You are given a small bar of an unknown metal X. You find the density of the metal to be 10.5 g/cm'. An X-ray diffraction experiment measures the edge of the face centered cubic unit cell as 4.09 (1 A = 10 m). Identify X 7. The radius of gold is 144 pm, and the density is 19.32 g/cm. Does elemental gold have a face-centered cubic structure or a body-centered cubic structure? B. Metallurgy 1. Iron is present in the earth's crust in many types of minerals. The iron oxide minerals are hematite (Fe,) and magnetite (Fe:0) What is the oxidation state of iron in each mineral? The iron ions in magnetite are a mixture of Fet and Fetions. What is the ratio of Felto Felons in magnetite? The formula for magnetite is often written as Feo. Feo Does this make sense? Explain 2 Silver is sometimes found in nature a large nuggets more often it is found mixed with other metals and their ores. Cyanide ion is often used to extract the silver by the following reaction that occurs in basic solution 1 Ag(s) + CN (aq) + 0,(e) Ag(CN)() Balance this equation by using the half-reaction method