Answer
452.7k+ views
- Hint: We know that the atomic number of Aluminium is 13 and the atomic number of Oxygen is 8. Using the criss-cross method we can determine the valency of Aluminium and Oxygen in Aluminium oxide or \[A{{l}_{2}}{{O}_{3}}\].
Complete step by step answer:
We know that according to Bohr’s atomic model, the number of electrons that can be present on the different shells is determined by the formula \[2({{n}^{2}})\], where n denotes the number of the shell.
Since the atomic number of Aluminium is 13, using the formula \[2({{n}^{2}})\] we get,
In the first shell, the number of electrons is \[2\times {{1}^{2}}=2\] electrons.
In the second shell, the number of electrons is \[2\times {{2}^{2}}=8\] electrons.
In the third shell, the number of valence electrons is = 3 electrons.
Since \[2+8+3=13\] electrons, the atomic number of Aluminium is 13.
Now, the atomic number of Oxygen is 8. Using the formula \[2({{n}^{2}})\] we get,
In the first shell, the number of electrons is \[2\times {{1}^{2}}=2\] electrons
In the second shell, the number of valence electrons = 6 electrons.
Since \[2+6=8\] electrons, the atomic number of Oxygen is 8.
Therefore, to attain the octet configuration, Aluminium loses 3 electrons, and Oxygen gains 2 electrons.
Now, we have to write the formula of Aluminium Oxide using the criss-cross method.
We know that in the criss-cross method the numerical value of each of the ion charges is crossed over to become the subscript of the other ion.
The charge of Aluminium is +3 and the charge of Oxygen is -2.
Therefore, we can conclude that the valency of Aluminium in \[A{{l}_{2}}{{O}_{3}}\] is 3 and the valency of Oxygen in \[A{{l}_{2}}{{O}_{3}}\] is 2.
Note: Aluminium loses the 3 valence electrons to gain the noble gas configuration of Neon, which is 2,8.
Similarly, Oxygen gains 2 valence electrons to gain the noble gas configuration of Neon, that is 2,8.
Complete step by step answer:
We know that according to Bohr’s atomic model, the number of electrons that can be present on the different shells is determined by the formula \[2({{n}^{2}})\], where n denotes the number of the shell.
Since the atomic number of Aluminium is 13, using the formula \[2({{n}^{2}})\] we get,
In the first shell, the number of electrons is \[2\times {{1}^{2}}=2\] electrons.
In the second shell, the number of electrons is \[2\times {{2}^{2}}=8\] electrons.
In the third shell, the number of valence electrons is = 3 electrons.
Since \[2+8+3=13\] electrons, the atomic number of Aluminium is 13.
Now, the atomic number of Oxygen is 8. Using the formula \[2({{n}^{2}})\] we get,
In the first shell, the number of electrons is \[2\times {{1}^{2}}=2\] electrons
In the second shell, the number of valence electrons = 6 electrons.
Since \[2+6=8\] electrons, the atomic number of Oxygen is 8.
Therefore, to attain the octet configuration, Aluminium loses 3 electrons, and Oxygen gains 2 electrons.
Now, we have to write the formula of Aluminium Oxide using the criss-cross method.
We know that in the criss-cross method the numerical value of each of the ion charges is crossed over to become the subscript of the other ion.
The charge of Aluminium is +3 and the charge of Oxygen is -2.
![seo images](https://www.vedantu.com/question-sets/8edfc6ee-e21e-4e66-a736-adf96d6c0fc57708184165640319839.png)
Therefore, we can conclude that the valency of Aluminium in \[A{{l}_{2}}{{O}_{3}}\] is 3 and the valency of Oxygen in \[A{{l}_{2}}{{O}_{3}}\] is 2.
Note: Aluminium loses the 3 valence electrons to gain the noble gas configuration of Neon, which is 2,8.
Similarly, Oxygen gains 2 valence electrons to gain the noble gas configuration of Neon, that is 2,8.
Recently Updated Pages
What are the figures of speech in the poem Wind class 11 english CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Write down 5 differences between Ntype and Ptype s class 11 physics CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Two tankers contain 850 litres and 680 litres of petrol class 10 maths CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
What happens when eggshell is added to nitric acid class 12 chemistry CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Why was Kamaraj called as Kingmaker class 10 social studies CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
What makes elections in India democratic class 11 social science CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Trending doubts
Summary of the poem Where the Mind is Without Fear class 8 english CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
One cusec is equal to how many liters class 8 maths 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)
Differentiate between homogeneous and heterogeneous class 12 chemistry CBSE
![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)
Fill the blanks with the suitable prepositions 1 The class 9 english 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)
The Equation xxx + 2 is Satisfied when x is Equal to Class 10 Maths
![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)