Problem Set 3
following problems will concentrate on Pauling's rules #1 and #2, and on
| 1. In order to have confidence in the
results of atomic structures obtained using Pauling's rule
#1, the % ionic bond character may be important to know--determine the % ionic
character for each single bond for each cation-anion for each mineral below--compare the overall % ionic
character of the cation-O bond with that of the cation-S bond--which bond type (cation-O or cation-S)
would probably give the better results (correct calculated CN) using Pauling's rules?
a. NaCl d. KCl g. CuS
b. CaF2 e. ZnS h. CaCO3
c. Fe2O3 f. As2S3 i. BaSO4
2. Do each of the following below;
a. using Pauling's rule #1 (radius ratio-coordination number) and #2 (electrostatic valence)
determine the atomic structures of each of the following minerals below--for correct structures
and to save additional calculations, revisit the notes on the iso-meso-aniso-desmic
bond types--Make sure you surround each cation and anion with the appropriate kind
and quantity of corresponding anion(s) and cation(s)
TiO2, MgCO3, PbSO4, ZnCO3, MnO2 ( Mn-O, CN=6), NaNO3, Mg2SiO4,
CaSO4 (formed at a low temperature), FeTiO3 , CaWO4 (formed at low temp),
b. state the name (iso-, meso-, aniso-desmic) of each individual bond in the above min-
3. Using the rules for ionic substitution, determine if Fe+2
can proxy for Si+4 in quartz, SiO2--
5. What is important about the a. mesodesmic bond and b. anisodesmic bond?
6. Be able to discuss the nature of Pauling's Rules 1- 5.