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AP EAMCET2006ChemistryStructure of Atom

Which of the following is not correct?

Options

  1. ANuclei of atoms participate in nuclear reactions
  2. B₂₀ Ca ⁴⁰ and ₁₈ Ar ⁴⁰ are isotones
  3. C1 amu of mass defect is approximately equal to 931.5 MeV
  4. DUranium ( U ²³⁸ ) series is known as (4 n+2) series

Correct answer

B. ₂₀ Ca ⁴⁰ and ₁₈ Ar ⁴⁰ are isotones

Step-by-step solution

Isotones are the species having same number of neutrons. In ₂₀ Ca ⁴⁰ , number of neutrons is 20 and in ₁₈ Ar ⁴⁰ , number of neutrons =22 . So, ₂₀ Ca ⁴⁰ and ₁₈ Ar ⁴⁰ are not isotones.

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