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  • (a) Distinguish between isotopes and isobars, giving one example for each. (b) Why is the mass of a nucleus always less than the sum of the masses of its constituents? Write one example to justify your answer.  

(a) Distinguish between isotopes and isobars, giving one example for each.

(b) Why is the mass of a nucleus always less than the sum of the masses of its constituents? Write one example to justify your answer.

 

 

Answers (1)

(a)Isotopes are the atoms having the same atomic number 

E .g.  _{17}^{35} \textrm{Cl}\; and\; _{17}^{37}\textrm{Cl}                                                                                           

 Isobars are the atoms  having the same mass number

 Eg. _{2}^{3} \textrm{He}\; and\; _{1}^{3}\textrm{H}                                                                    

(b) Mass of a nucleus is less than its constituents because, in the bound state, some mass is converted into binding energy.

eg. mass of _{8}^{16} \textrm{O}\; nucleus is less than the sum of masses of 8 protons and 8 neutrons.   

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Safeer PP

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