Which of the following is not correct?
- ANuclei 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 $931.5 \ MeV$
- DUranium $(U^{238})$ series is known as $(4n+2)$ series
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