Formation of a nucleus from its nucleons is accompanied by:

  • A
    Decrease in mass
  • B
    Increase in mass
  • C
    No change in mass
  • D
    None of these

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The atomic mass of lead is $208$ and atomic number is $82$. The atomic mass of bismuth is $209$ and atomic number is $83$. The ratio of $n/p$ in the atom is

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