Answer
351k+ views
Hint: Every atom is composed of a nucleus and this nucleus is made up of protons and neutrons where protons is positively charged and neutrons are neutral in charge and electrons which are negatively charged are revolving around the nucleus.
Complete answer:
The mass number reports the mass of the atoms present in the nucleus in atomic mass units represented by the term amu.
Now in the given case we are considering the atomic mass of iodine is 131 not 126.904 this can be explained on the concept of isotopes where isotopes can be defined as those compounds which have the same chemical element but different atomic mass numbers. Atomic mass number is given by the total number of protons and neutrons. These have the same number of protons but different numbers of neutrons and the number next to an isotope is mass number. For a typical iodine compound atomic mass should be 126.904 g/mol which contains 53 protons and 74 neutrons.
On the other hand an isotope of iodine-131 which has 53 protons and 78 neutrons have mass number 131.
Hence we can say that 126.904 is the average atomic mass of Iodine and Iodine-131 is an isotope of Iodine.
Note:
Atomic number and mass number are always whole numbers because these are calculated by counting whole objects i.e. protons, neutrons, and electrons. The sum of the mass number and the atomic number for an atom corresponds to the total number of subatomic particles present in the atom.
Complete answer:
The mass number reports the mass of the atoms present in the nucleus in atomic mass units represented by the term amu.
Now in the given case we are considering the atomic mass of iodine is 131 not 126.904 this can be explained on the concept of isotopes where isotopes can be defined as those compounds which have the same chemical element but different atomic mass numbers. Atomic mass number is given by the total number of protons and neutrons. These have the same number of protons but different numbers of neutrons and the number next to an isotope is mass number. For a typical iodine compound atomic mass should be 126.904 g/mol which contains 53 protons and 74 neutrons.
On the other hand an isotope of iodine-131 which has 53 protons and 78 neutrons have mass number 131.
Hence we can say that 126.904 is the average atomic mass of Iodine and Iodine-131 is an isotope of Iodine.
Note:
Atomic number and mass number are always whole numbers because these are calculated by counting whole objects i.e. protons, neutrons, and electrons. The sum of the mass number and the atomic number for an atom corresponds to the total number of subatomic particles present in the atom.
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)