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NEET2014ChemistryStructure of AtomActual

Which of the following pairs represent isotones?

Options

  1. A₃₃⁷⁷ As , ₃₄⁷⁸ Se
  2. B₇₈¹⁹⁵ Pt , ₇₆¹⁹⁰ Os
  3. C₄₇¹⁰⁸ Ag , ₄₈¹¹² Cd
  4. D₇₂¹⁷⁸ Hf , ₅₆¹³⁷ Ba

Correct answer

A. ₃₃⁷⁷ As , ₃₄⁷⁸ Se

Step-by-step solution

Isotones have the same number of neutrons. As =77-33=44 ; Se =78-34=44

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