The mass of an $\alpha$-particle is . . . . . . .

  • A
    Less than the combined mass of $2$ protons and $2$ neutrons.
  • B
    Equal to the mass of $4$ protons.
  • C
    Equal to the mass of $4$ neutrons.
  • D
    Equal to the mass of $2$ protons and $2$ neutrons.

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