Answer
414.6k+ views
Hint: Think about the difference between atomic number and atomic mass number. Write the formula used to calculate the atomic mass number and calculate the mass of protons. From the mass of protons, identify the element to get the answer for this question.
Complete step by step solution:
- Atomic number, Z is the total number of protons or electrons present in an atom.
- Therefore, Z = No. of protons/electrons (1)
- Atomic mass number, A is the sum of the total number of protons and neutrons present in an atom.
- Therefore, A = No. of protons + No. of neutrons (2)
- Substituting equation (1) in equation (2) we get,
A = Z + No. of neutrons (3)
- Now, in the question we have been given, the mass number is 20 so, A= 20 and the number of neutrons is 11.
- Substituting the above values in equation (3) we get,
A = Z + No. of neutrons
20 = Z + 11
Z = 20 – 11 = 9
- Therefore, the atomic number of the element is 9. The element having atomic number 9 is fluorine.
- Therefore, the element having a mass number of 20 and containing 11 neutrons is fluorine.
- Therefore, the answer is option (C).
Note: Remember atomic mass number is the sum of both neutrons and protons whereas atomic number is the total number of protons or electrons. For hydrogen, there is no neutron and so the atomic number is equal to atomic mass number.
Complete step by step solution:
- Atomic number, Z is the total number of protons or electrons present in an atom.
- Therefore, Z = No. of protons/electrons (1)
- Atomic mass number, A is the sum of the total number of protons and neutrons present in an atom.
- Therefore, A = No. of protons + No. of neutrons (2)
- Substituting equation (1) in equation (2) we get,
A = Z + No. of neutrons (3)
- Now, in the question we have been given, the mass number is 20 so, A= 20 and the number of neutrons is 11.
- Substituting the above values in equation (3) we get,
A = Z + No. of neutrons
20 = Z + 11
Z = 20 – 11 = 9
- Therefore, the atomic number of the element is 9. The element having atomic number 9 is fluorine.
- Therefore, the element having a mass number of 20 and containing 11 neutrons is fluorine.
- Therefore, the answer is option (C).
Note: Remember atomic mass number is the sum of both neutrons and protons whereas atomic number is the total number of protons or electrons. For hydrogen, there is no neutron and so the atomic number is equal to atomic mass number.
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)