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Question

The composition of an atom P is 13.    11.       11 . What is the mass number? 


Solution

Dear Student.. 

To do this question we need to know these two things... 

1) In an atom, number of electrons and protons are equal

2)
Mass no = No. of protons + No. of neutrons.


Here two equal value given are 11, 11
So number of electrons and protons are 11

And the remaining 13 is the number of neutrons 


So, 
Mass no =13 + 11
                = 24

 

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