' Potassium - 40 and Calcium - 40 are isobars : TRUE / FALSE .' According to me it is FALSE, as Argon - 40 and Calcium - 40 are isobars! But if you go in Study, science, Activities, chapter : structure of an atom, the last activity, 5th question it is given TRUE in the results! Please explain me the above result, how's it possible! I'm unable to understand!!! 

Dear Student,

Please find below the solution to the asked query.

Any species which have same mass number but different atomic numbers are knows as isobars. Since, potassium-40 and calcium-40 have same atomic mass, but they have different atomic numbers, they are isobars.

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Akanksha Jain

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why don't calcium be isobar of both ARGON and POTASSIUM ?. I THINK IT IS POSSIBLE. 
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yes ,argon,potassium,and calcium have same mass no.i.e 40 and Different  atomic no..This are only called isobars
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No, Potassium's atomic number / mass number is 39u, right!
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I mean Potassium's atomic mass is 39, right!
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So, how can it be the isobar of calcium?
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it can be isobar of calcium because potassium-39 And potassium-40 are isotopes and potassium-40, argon-40& Calcium-40 are isobars
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Thank you @Abhraneel Das, really thank you very much! Your answer is the only one which answered my question!!!
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your welcome, i am really honoured that only my answer satisfied you.
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