Compound Ion FeO Fe2- O2- ZnTe Zn2+ Te2-
Ionic Radius (nm) 0.077 0.140 0.074 0.224
Structure Rock Salt Cesium Chloride Zinc Blende
Madelung Constant 1.74756 1.76267 1.63806
Ion configuration He Ne Ar; Cu+ K+ Ag+ Xe Au+
Born Exponent 5 7 9 10 12
a) Determine the crystal structures of FeO and ZnTe.
b) Estimate their lattice parameters.
c) Calculate the density of ZnTe.
d) Calculate molar lattice energies and determine which compound has a higher melting point.
e) Draw two bonding curves on one graph representing the two compounds. Indicate the equilibrium bond lengths and bond energies.