When a radioactive element emits an electron,the daughter element formed will have:

  • A
    Mass number one unit less
  • B
    Atomic number one unit less
  • C
    Mass number one unit more
  • D
    Atomic number one unit more

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If uranium (mass number $238$ and atomic number $92$) emits an $\alpha$-particle,what are the mass number and atomic number of the product?

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