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JIPMER 2007
Exam
JIPMER
Year
2007
Subject
Physics
Chapter
Nuclear Physics

JIPMER 2007 · Physics · Nuclear Physics

The nuclei of which one of the following pairs of nuclei are...

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

Options

  1. A34Se74,31Ga71{ }_{34} \mathrm{Se}^{74},{ }_{31} \mathrm{Ga}^{71}
  2. B42Mo92,40Zr92{ }_{42} \mathrm{Mo}^{92},{ }_{40} \mathrm{Zr}^{92}
  3. C38Sr84,38Sr86{ }_{38} \mathrm{Sr}^{84}, 38 \mathrm{Sr}^{86}
  4. D20Ca40,16 S32{ }_{20} \mathrm{Ca}^{40},{ }_{16} \mathrm{~S}^{32}

Correct answer

A. 34Se74,31Ga71{ }_{34} \mathrm{Se}^{74},{ }_{31} \mathrm{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 34Se74{ }_{34} \mathrm{Se}^{74} and 31Ga71{ }_{31} \mathrm{Ga}^{71} are isotones as A−Z=74−34=71−31=40A-Z=74-34=71-31=40
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