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Composition of the nuclei of two atomic ...

Composition of the nuclei of two atomic species A and B is given as under :
`{:(,"A","B"),("Protons :",18,20),("Neutrons :",22,20):}`
Give the mass numbers of A and B. What is the relation between the two species and which element or elements they represent ?

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The correct Answer is:
Mass number of A = 40 ; B =40 ; Isobars : A is Argon, B is Calcium
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