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Two ions A+ and B- have radii 88 pm and 200 pm recpectively. In the close packed crystal of compound AB,predic the coordination number of A+ ?
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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.
Community Answer
Two ions A+ and B- have radii 88 pm and 200 pm recpectively. In the cl...
As the limiting ratio(88/200) is 0.44 , and for a compound whose limiting ratio lies between 0.414 to 0.732 it's coordination no. is 6 . And the type of void will be Octahedral .
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Read the passage given below and answer the following questions:In ideally ionic structures, the coordination numbers of the ions are determined by electrostatic considerations. Cations surround themselves with as many anions as possible and vice versa. This maximizes the attractions between neighbouring ions of opposite charge and hence maximizes the lattice energy of the crystal. This requirement led to the formulation of the radius ratio rule for ionic structures in which the ions and the structure adopted for a particular compound depend on the relative sizes of the ions. Thus, for the stable ionic crystalline structures, there is definite radius ratio limit for a cation to fit perfectly in the lattice of anions, called radius ratio rule. This depends upon the ratio of radii of two types of ions, r+/r–.This ratio for coordination numbers 3, 4, 6 and 8 are respectively 0.155 – 0.225, 0.225 -0.414, 0.414 -0.732 and 0.732 – 1.000. The coordination number of ionic solids also depends upon temperature and pressure. On applying high pressure, coordination number increases. On the other hand, on applying high temperature, it decreases.Q. If the radius of Nation is 95 pm and that of Cl– ion is 181 pm, the coordination number of Na+ ion is

Read the passage given below and answer the following questions:In ideally ionic structures, the coordination numbers of the ions are determined by electrostatic considerations. Cations surround themselves with as many anions as possible and vice versa. This maximizes the attractions between neighbouring ions of opposite charge and hence maximizes the lattice energy of the crystal. This requirement led to the formulation of the radius ratio rule for ionic structures in which the ions and the structure adopted for a particular compound depend on the relative sizes of the ions. Thus, for the stable ionic crystalline structures, there is definite radius ratio limit for a cation to fit perfectly in the lattice of anions, called radius ratio rule. This depends upon the ratio of radii of two types of ions, r+/r–.This ratio for coordination numbers 3, 4, 6 and 8 are respectively 0.155 – 0.225, 0.225 -0.414, 0.414 -0.732 and 0.732 – 1.000. The coordination number of ionic solids also depends upon temperature and pressure. On applying high pressure, coordination number increases. On the other hand, on applying high temperature, it decreases.Q.Which is not the correct statement for ionic solids in which positive and negative ions are held by strong electrostatic attractive forces?

Read the passage given below and answer the following questions:In ideally ionic structures, the coordination numbers of the ions are determined by electrostatic considerations. Cations surround themselves with as many anions as possible and vice versa. This maximizes the attractions between neighbouring ions of opposite charge and hence maximizes the lattice energy of the crystal. This requirement led to the formulation of the radius ratio rule for ionic structures in which the ions and the structure adopted for a particular compound depend on the relative sizes of the ions. Thus, for the stable ionic crystalline structures, there is definite radius ratio limit for a cation to fit perfectly in the lattice of anions, called radius ratio rule. This depends upon the ratio of radii of two types of ions, r+/r–.This ratio for coordination numbers 3, 4, 6 and 8 are respectively 0.155 – 0.225, 0.225 -0.414, 0.414 -0.732 and 0.732 – 1.000. The coordination number of ionic solids also depends upon temperature and pressure. On applying high pressure, coordination number increases. On the other hand, on applying high temperature, it decreases.Q.If the pressure of CsCl is increased, then its coordination number will

Two ions A+ and B- have radii 88 pm and 200 pm recpectively. In the close packed crystal of compound AB,predic the coordination number of A+ ?
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