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Observe the following statements regardi...

Observe the following statements regarding isotones i) `.^(59)K_(19)` and `.^(40)Ca_(20)` are isotones
ii) Nuclides having different atomic numbers `(z)` and mass number `(A)` but same number of neutrons `(n)` are called Isotones iii) `.^(19)F_(9)` and `.^(23)Na_(11)` are isotones The correct answer is

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