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the answer is 40 because isobars have same mass number and different atomic number
sunaina1308:
the answer is D), i require the reason
I am really sorry I haven't read the question
here it is given that X and K are isobaric means they have same mass but X and K are isotopic means it is compulsory that both have same atomic no. whereas they can have different atomic mass so it cannot be 40
ty
welcome..sorry once agai
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