1- Calculate the atomic packing factor of a crystal of cesium chloride KCl that crystallizes in a body-centered cubic system BCC. The radius of a chlorine atom rci = 1.81A, and the radius of potassium rk = 1.33A? 88 2- Calculate the atomic packing factor of a face-centered cell unit FCC

1- Calculate the atomic packing factor of a crystal of cesium chloride KCl that crystallizes in a body-centered cubic system BCC. The radius of a chlorine atom rci = 1.81A, and the radius of potassium rk = 1.33A? 88 2- Calculate the atomic packing factor of a face-centered cell unit FCC

Physical Chemistry

2nd Edition

ISBN:9781133958437

Author:Ball, David W. (david Warren), BAER, Tomas

Publisher:Ball, David W. (david Warren), BAER, Tomas

Chapter12: Atoms And Molecules

Section: Chapter Questions

Problem 12.12E: Are mathematical expressions for the following potential energies positive or negative? Explain why...

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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

Q1 and Q2 please

Planck's constant ħ = 1.05 · 10–34 Js, electron rest mass me = 9.11 · 10−³1 kg
electron charge e = 1.6 · 10-¹⁹ As, Boltzmann's constant k = 1.38 · 10-²³JK¹,
Avogadro's constant N₁ = 6.02 -10²3 mol¯¹, gas constant R = 8.31 J/(mol K).
1- Calculate the atomic packing factor of a crystal of cesium chloride KCl that
crystallizes in a body-centered cubic system BCC. The radius of a chlorine
atom rci = 1.81A, and the radius of potassium TK = 1.33A?
88
2- Calculate the atomic packing factor of a face-centered cell unit FCC

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