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(A) An $\alpha$-particle is a helium nucleus $(_{2}^{4}He^{2+})$,which consists of $2$ protons and $2$ neutrons.According to the mass-energy equivalen

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Less than the combined mass of $2$ protons and $2$ neutrons.

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(A) An $\alpha$-particle is a helium nucleus $(_{2}^{4}He^{2+})$,which consists of $2$ protons and $2$ neutrons.According to the mass-energy equivalence principle,the mass of a nucleus is always less than the sum of the masses of its individual constituent nucleons due to the mass defect $(\Delta m)$,which is converted into binding energy $(E = \Delta m c^2)$.Therefore,the mass of an $\alpha$-particle is slightly less than the combined mass of $2$ free protons and $2$ free neutrons.

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

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