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Manipal MET2012ChemistryStructure of Atom

The triad of the nuclei that is isotonic, is

Options

  1. A₆ C ¹⁴, ₇ ~N ¹⁴, ₉ ~F ¹⁹
  2. B₆ C ¹⁴, ₇ ~N ¹⁵, ₉ ~F ¹⁷
  3. C₆ C ¹⁴, ₇ ~N ¹⁴, ₉ ~F ¹⁷
  4. D₆ C ¹², ₇ ~N ¹⁴, ₉ ~F ¹⁹

Correct answer

B. ₆ C ¹⁴, ₇ ~N ¹⁵, ₉ ~F ¹⁷

Step-by-step solution

Isotonic species have the same the number of neutrons. No. of neutrons in aligned & ₆ C ¹⁴=14-6=8 & ₇ ~N ¹⁴=14-7=7 & ₉ ~F ¹⁹=19-9=10 & ₇ ~N ¹⁵=15-7=8 & ₉ ~F ¹⁷=15-7=8 & ₆ C ¹²=12-6=6 aligned Hence, ₆ C ¹⁴, ₇ ~N ¹⁵, ₉ ~F ¹⁷ are isotonic.

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