
(a)
Interpretation:
The expected coordination number for Y2O3 compound is determined using the ionic radii in given B appendix.
Concept Introduction:
The Y2O3 is the yttrium oxide which is stable in the atmosphere and is a white substance that is in the solid form. In inorganic compounds and science the yttrium oxide is used as the starting material. Here, in the compound, cation is Y3+ and anion is O2− thus, according to the formula there will be 2 cations and 3 anions. The ratio of radius of cation to anion can helps in determining the coordination number of the compound from table B in Appendix

Answer to Problem 3.85P
6 is the coordination number.
Explanation of Solution
For the selected elements the radii of atoms and ions from the table are given as,
rY+3=0.890ArO−2=1.320A
The ratio of the radius is given as,
rY+3rO−2=0.890A1.320A⇒0.67
From the table the coordination number of Y2O3 is given as 6
(b)
Interpretation:
The expected coordination number for UO2 compound is determined using the ionic radii in given B appendix.
Concept Introduction:
Uranium dioxide also called as Urania is black in color. This element is radioactive and powdered crystalline and it is found in the uraninite mineral. From the formula, UO2the cation is U4+ and anion is O2−. The number of cations is 1 and that of anion is 2. The ratio of radius of cation to anion can helps in determining the coordination number of the compound from table B in Appendix

Answer to Problem 3.85P
6 is the coordination number.
Explanation of Solution
For the selected elements the radii of atoms and ions from the table are given as,
rU+4=0.970ArO−2=1.320A
The ratio of the radius is given as,
rU+4rO−2=0.970A1.320A⇒0.73
From the table the coordination number of UO2is given as 6
(c)
Interpretation:
The expected coordination number for BaO compound is determined using the ionic radii in given B appendix.
Concept Introduction:
The compound Barium oxide is non-flammable. It is white in color and the structure of the compound is cube. It is used in the crown glass, cathode ray tubes and catalyst. From the formula there will be 1 cation that is Ba2+ and 1 anion that is O2−. The ratio of radius of cation to anion can helps in determining the coordination number of the compound from table B in Appendix.

Answer to Problem 3.85P
8 is the coordination number.
Explanation of Solution
For the selected elements the radii of atoms and ions from the table are given as,
rBa+2=1.340ArO−2=1.320A
The ratio of the radius is given as,
rBa+2rO−2=1.340A1.320A⇒0.99
From the table the coordination number of BaO is given as 8
(d)
Interpretation:
The expected coordination number for Si3N4 compound is determined using the ionic radii in given B appendix.
Concept Introduction:
The compound silicon nitride is a compound that is made of nitrogen and silicon. This chemical compound is stable

Answer to Problem 3.85P
4 is the coordination number.
Explanation of Solution
For the selected elements the radii of atoms and ions from the table are given as,
rN−3=0.150ArSi+4=0.420A
The ratio of the radius is given as,
rN−3rSi+4=0.150A0.420A⇒0.36
From the table the coordination number of Si3N4 is given as 4
(e)
Interpretation:
The expected coordination number for GeO2 compound is determined using the ionic radii in given B appendix.
Concept Introduction:
GeO2 Compound is also called as germanium oxide which is the germanium salt. This compound is inorganic and it is main source for commercial. With contact of pure germanium the compound forms layer of passivation. From the formula of the compound, the anion and cation will be O2− and Ge4+ respectively. The ratio of radius of cation to anion can helps in determining the coordination number of the compound from table B in Appendix

Answer to Problem 3.85P
4 is the coordination number.
Explanation of Solution
For the selected elements the radii of atoms and ions from the table are given as,
rGe+4=0.530ArO−2=1.320A
The ratio of the radius is given as,
rGe+4rO−2=0.530A1.320A⇒0.40
From the table the coordination number of GeO2 is given as 4
(f)
Interpretation:
The expected coordination number for MnO compound is determined using the ionic radii in given B appendix.
Concept Introduction:
The MnO compound is inorganic and green crystals are formed by them. It acts as the food additives and fertilizer on a large scale. From the formula, the cation and anion will be Mn2+ and O2−.
The ratio of radius of cation to anion can helps in determining the coordination number of the compound from table B in Appendix

Answer to Problem 3.85P
6 is the coordination number.
Explanation of Solution
For the selected elements the radii of atoms and ions from the table are given as,
rMn+2=0.800ArO−2=1.320A
The ratio of the radius is given as,
rMn+2rO−2=0.800A1.320A⇒0.61
From the table B in Appendix, the coordination number of MnO is given as 6
(g)
Interpretation:
The expected coordination number for MgS compound is determined using the ionic radii in given B appendix.
Concept Introduction:
The MgS compound is inorganic and white in color. It accumulates in the impure form and it is made of crystalline material. In the impure form it is in the brown color and the material becomes non crystalline powder. From the formula, the cation is Mg2+ and anion is S−. The ratio of radius of cation to anion can helps in determining the coordination number of the compound from table B in Appendix

Answer to Problem 3.85P
6 is the coordination number.
Explanation of Solution
For the selected elements the radii of atoms and ions from the table are given as,
rMg+2=0.660ArS−2=1.320A
The ratio of the radius is given as,
rMg+2rS−2=0.660A1.320A⇒0.50
From the table the coordination number of MgS is given as 6
(h)
Interpretation:
The expected coordination number for KBr compound is determined using the ionic radii in given B appendix.
Concept Introduction:
Potassium bromide is the salt of ions and in the aqueous solution has pH 7 where it is completely dissociated. This compound is the bromide ions source. From the formula, the cation is K+ and anion is Br−. The ratio of radius of cation to anion can helps in determining the coordination number of the compound from table B in Appendix.

Answer to Problem 3.85P
6 is the coordination number.
Explanation of Solution
For the selected elements the radii of atoms and ions from the table are given as,
rK+1=1.330ArBr−1=1.960A
The ratio of the radius is given as,
rK+1rBr−1=1.330A1.960A⇒0.68
From the table the coordination number of KBr is given as 6
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Chapter 3 Solutions
Essentials Of Materials Science And Engineering
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