Two ions A+ and B- have radii 88 pm and 200 pm recpectively. In the cl...
Coordination Number of Ion A in Compound AB
Introduction
In a close-packed crystal such as Compound AB, each ion is surrounded by a certain number of neighboring ions. This number is known as the coordination number. In this case, we are asked to determine the coordination number of ion A in Compound AB.
Ion Radii
Before we can determine the coordination number, we need to consider the radii of the ions. Ion A has a radius of 88 pm, while ion B- has a radius of 200 pm.
Close Packing
In a close-packed crystal, the ions are arranged in a way that maximizes the number of nearest neighbors for each ion. This is achieved through either a face-centered cubic (FCC) or a hexagonal close-packed (HCP) structure.
Calculation
To determine the coordination number of ion A, we need to consider the arrangement of the ions in Compound AB. Based on the radii of the ions, it is likely that the compound has an FCC structure. In an FCC structure, each ion has 12 nearest neighbors.
However, it is important to note that the coordination number can vary depending on the specific arrangement of the ions in the crystal. Therefore, we cannot definitively state that the coordination number of ion A in Compound AB is 12 without additional information about the crystal structure.
Conclusion
In conclusion, the coordination number of ion A in Compound AB cannot be definitively determined without additional information about the crystal structure. However, based on the radii of the ions and the likely FCC structure, it is possible that the coordination number is 12.