Which of the following is not correct?

  • A
    Nuclei of atoms participate in nuclear reactions
  • B
    $_{20}Ca^{40}$ and $_{18}Ar^{40}$ are isotones
  • C
    $1 \ amu$ of mass defect is approximately equal to $931.5 \ MeV$
  • D
    Uranium $(U^{238})$ series is known as $(4n+2)$ series

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