Answer
397.2k+ views
Hint: The imperfection in the crystals implies the imperfect arrangement of the constituent ions is due to the presence of cationic or anionic vacancies in the lattice points or dissociation of ions in the lattice. This imperfection is known as a defect.
Complete step by step answer:
The atomic defects or point defect is the defect that occurs in ionic crystals when the number of cations and anions missing are equal or when an ion of the ionic crystals is missing and is shifted to a vacant interstitial site structure.
Point defects are found in both stoichiometric and non stoichiometric crystals which are known as stoichiometric defects and non stoichiometric defects respectively.
Both the type of point defects can be seen in NaCl,
(a) stoichiometric defect :
The Schottky defects are seen in NaCl. The defects are created when the same number of $C{l^ - }$ and $N{a^ + }$ is missing from their position in the lattice and creating holes. Even after missing some ions, it will be electrically neutral.
(b) Non-stoichiometric defect:
Metals excess defect produced by the presence of extra one or more cations in the interstitial site, this defect is seen in NaCl. This defect is produced when one or more $N{a^ + }$ ions occupy interstitial sites. Then, in order to maintain the crystal electrically neutral, equal number of electrons trapped into the interstitial sites.
The number of metals are excess in the crystal so the defect is known as metal excess defect.
Note: Note: NaCl is actually colourless crystal. Metals excess defect is a type of non-stoichiometric defect. Non-stoichiometric defect NaCl is yellow in colour, this is one of the consequences of metal excess defect.
Complete step by step answer:
The atomic defects or point defect is the defect that occurs in ionic crystals when the number of cations and anions missing are equal or when an ion of the ionic crystals is missing and is shifted to a vacant interstitial site structure.
Point defects are found in both stoichiometric and non stoichiometric crystals which are known as stoichiometric defects and non stoichiometric defects respectively.
Both the type of point defects can be seen in NaCl,
(a) stoichiometric defect :
The Schottky defects are seen in NaCl. The defects are created when the same number of $C{l^ - }$ and $N{a^ + }$ is missing from their position in the lattice and creating holes. Even after missing some ions, it will be electrically neutral.
![seo images](https://www.vedantu.com/question-sets/4df37d67-05bd-4069-8f4d-aa4054bd2e285219383253869312673.png)
(b) Non-stoichiometric defect:
Metals excess defect produced by the presence of extra one or more cations in the interstitial site, this defect is seen in NaCl. This defect is produced when one or more $N{a^ + }$ ions occupy interstitial sites. Then, in order to maintain the crystal electrically neutral, equal number of electrons trapped into the interstitial sites.
![seo images](https://www.vedantu.com/question-sets/08740874-9eed-4819-af7a-62ea09231ce25374979008865143736.png)
The number of metals are excess in the crystal so the defect is known as metal excess defect.
Note: Note: NaCl is actually colourless crystal. Metals excess defect is a type of non-stoichiometric defect. Non-stoichiometric defect NaCl is yellow in colour, this is one of the consequences of metal excess defect.
Recently Updated Pages
How many sigma and pi bonds are present in HCequiv class 11 chemistry CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Why Are Noble Gases NonReactive class 11 chemistry CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Let X and Y be the sets of all positive divisors of class 11 maths CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Let x and y be 2 real numbers which satisfy the equations class 11 maths CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Let x 4log 2sqrt 9k 1 + 7 and y dfrac132log 2sqrt5 class 11 maths CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Let x22ax+b20 and x22bx+a20 be two equations Then the class 11 maths CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Trending doubts
Fill the blanks with the suitable prepositions 1 The class 9 english CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
At which age domestication of animals started A Neolithic class 11 social science CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Which are the Top 10 Largest Countries of the World?
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Give 10 examples for herbs , shrubs , climbers , creepers
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Difference between Prokaryotic cell and Eukaryotic class 11 biology CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Difference Between Plant Cell and Animal Cell
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Write a letter to the principal requesting him to grant class 10 english CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Change the following sentences into negative and interrogative class 10 english CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Fill in the blanks A 1 lakh ten thousand B 1 million class 9 maths CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)