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A nuclide 1 is said to be the mirror isobar of nuclide 2 if and
(a) What nuclide is a mirror isobar of ?
(b) Which nuclide out of the two mirror isobars have greater binding energy and why?

a) We are given that a nuclide 1 is to be the mirror isobar of nuclide 2 if,

and

As a result, mirror isobar is

and

b) has greater binding energy than .