7. Consider a cubic array of bromide ions in which the anions are touching along the face of the cube. What is the maximum radius (in angstroms) that a cation could have and still fit in the octahedral holes on the edges of the FCC unit cell?

7. Consider a cubic array of bromide ions in which the anions are touching along the face of the cube. What is the maximum radius (in angstroms) that a cation could have and still fit in the octahedral holes on the edges of the FCC unit cell?

Chemistry

9th Edition

ISBN:9781133611097

Author:Steven S. Zumdahl

Publisher:Steven S. Zumdahl

Chapter10: Liquids And Solids

Section: Chapter Questions

Problem 5RQ: What is a lattice? What is a unit cell? Describe a simple cubic unit cell. How many net atoms are...

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Concept explainers

Crystal Lattices and Unit Cell

Consider a crystal. The regular and repeating pattern of constituent particles is the most distinguishing feature of crystalline solids. A crystal lattice is formed when these particles are replaced with representative points. The three-dimensional arrangement of constituent particles is known as a crystal lattice. Unit cell is that the smallest portion of a space lattice which when repeated in several directions, generate the whole lattice. Unit cell is a building block of a lattice. It is the smallest unit of cell.

Question

7. Consider a cubic array of bromide ions in which the anions are touching along the face of the cube. What is
the maximum radius (in angstroms) that a cation could have and still fit in the octahedral holes on the edges
of the FCC unit cell?

Atom
Atomic Radius (pm)
Ionic Radius (pm)
Na
186
95.0
Se
117
191 (Se?)
Cs
265
169
181
196
99.0
Br
114
Zn
135
170.
227
74.0
TI
147 (TI*)
133
184
K
S
104
I
133
220.

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