i) Define a unit cellii) What is the coordination number of Na" in a NaCl crystal lattice?ii) Using Bragg's equation, calculate the distance between layers of ions in the crystal c) The figure below shows a NaCl unit cell. When x-rays of wavelength 0.1541 nm was allowed to pass through a NaClcrystal, reinforcement of the x-rays first occurred when the angle between the direction of the rays and the crystal face is14.140Pege 2 of 7CTRRPINWCTA0715/P2MOCK 2021

There are mainly three states of matter-solid, gas, and liquid. In a solid-state, atoms are arranged…

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) Define a unit cell i) What is the coordination number of Na in a NaCl crystal lattice? iD Urinn R

Physical Chemistry

2nd Edition

ISBN:9781133958437

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

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

Chapter21: The Solid State: Crystals

Section: Chapter Questions

Problem 21.43E

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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

i) Define a unit cell
ii) What is the coordination number of Na" in a NaCl crystal lattice?
ii) Using Bragg's equation, calculate the distance between layers of ions in the crystal

c) The figure below shows a NaCl unit cell. When x-rays of wavelength 0.1541 nm was allowed to pass through a NaCl
crystal, reinforcement of the x-rays first occurred when the angle between the direction of the rays and the crystal face is
14.140
Pege 2 of 7
CTRRPINWCTA0715/P2MOCK 2021

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