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AIIMS 2014
Exam
AIIMS
Year
2014
Subject
Chemistry
Chapter
Structure of Atom

AIIMS 2014 · Chemistry · Structure of Atom

Which of the following pairs represent isotones?

Which of the following pairs represent isotones?

Options

  1. A3377As,3478Se{ }_{33}^{77} \mathrm{As},{ }_{34}^{78} \mathrm{Se}
  2. B78195Pt,76190Os{ }_{78}^{195} \mathrm{Pt},{ }_{76}^{190} \mathrm{Os}
  3. C47108Ag,48112Cd{ }_{47}^{108} \mathrm{Ag},{ }_{48}^{112} \mathrm{Cd}
  4. D72178Hf,56137Ba{ }_{72}^{178} \mathrm{Hf},{ }_{56}^{137} \mathrm{Ba}

Correct answer

A. 3377As,3478Se{ }_{33}^{77} \mathrm{As},{ }_{34}^{78} \mathrm{Se}

Step-by-step solution

Isotones have the same number of neutrons. As =77−33=44;Se=78−34=44=77-33=44 ; \mathrm{Se}=78-34=44
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