1.

Which of these is a pairs of isobar

Answer»

`6^(C^(12)) , 8^(O^(16))`
`6^(C^(13)) , 6^(O^(14))`
`20^(Ca^(40)) , 18^(Ar^(10))`
`20^(Ca^(40)) , 18^(Ar^(10))`

ANSWER :C


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