GEOS 306 Midterm: GEOS 306 University of Arizona Midterm 1 2005
31 Jan 2019
School
Department
Course
Professor
Document Summary
1: (12 pts) make three spin diagrams that describe the electronic structures of atomic iron (fe), and the two ionic states, fe2+ and fe3+. 2: (20 pts) enumerate the 7 types of bonding, with a short description and an example of each. 3: a) (10 pts) suppose the illustrated figures represent closest-packed arrangements of anions. Identify the different locations where cations could be coordinated with 2, 3, 4, 6, or 12 anions. In the position of the cation, write its coordination number: (10 pts) label the packing type for each of the following diagrams. 4: (15 pts) derive the radius-ratio rule parameter (rc/ra = . 414) for a 4- coordinated square planar cation. Draw a picture and carefully label everything so that your answer can be evaluated properly. 5: (25 pts) pyrope, mg3al2si3o12, is an important rock-forming mineral whose presence indicates a high-pressure, or deep earth source.
