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Isobar, "Any of two or more kinds of atoms having the same atomic mass but different atomic numbers": Manganese-56, Iron-56, Cobalt-56, Nickel-56, Copper-56 
(each have 56 amu/atom) 
Isobars argon-40, calcium-40, sulphur-40, potassium-40 are example of isobars....
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