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JIPMER2007PhysicsNuclear Physics

The nuclei of which one of the following pairs of nuclei are isotones ?

Options

  1. A₃₄ Se ⁷⁴, ₃₁ Ga ⁷¹
  2. B₄₂ Mo ⁹², ₄₀ Zr ⁹²
  3. C₃₈ Sr ⁸⁴, 38 Sr ⁸⁶
  4. D₂₀ Ca ⁴⁰, ₁₆ ~S ³²

Correct answer

A. ₃₄ Se ⁷⁴, ₃₁ Ga ⁷¹

Step-by-step solution

The nuclei which have same number of neutrons but different atomic number and mass number are known as isotones. In choice (a) nuclei of ₃₄ Se ⁷⁴ and ₃₁ Ga ⁷¹ are isotones as A-Z=74-34=71-31=40

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