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The composition of two atomic particles ...

The composition of two atomic particles is given below :
`{:(,"X","Y"),("Protons :",8,8),("Neutrons :",8,9),("Electrons :",8,8):}`
(i) What is the mass number of X ?
(ii) What is the mass number of Y ?
(iii) What is the relation between X and Y ?
(iv) Which element/elements do they represent ?

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