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AP EAMCET2004ChemistryStructure of Atom

Which of the following is correct?

Options

  1. A₁ H ^1 and ₂ He ^3 are isotopes
  2. B₆ C ¹⁴ and ₇ N ¹⁴ are isotopes
  3. C₁₉ K ¹⁹ and ₂₀ Ca ⁴⁰ are isotopes
  4. D₉ F ¹⁹ and ₁₁ Na ²⁴ are isotopes

Correct answer

C. ₁₉ K ¹⁹ and ₂₀ Ca ⁴⁰ are isotopes

Step-by-step solution

Isotones are species which have equal number of neutrons. neutrons in ₁₉ ~K ³⁹=39-19=20 neutrons in ₂₀ Ca ⁴⁰=40-20=20 .

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