The mass of an \( \alpha \)-particle is....

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The mass of an \( \alpha \)-particle is
\( \mathrm{P} \)
(1) Less than the sum of masses of two protons and
W
two neutrons
(2) Equal to mass of four protons
(3) Equal to mass of four neutrons
(4) Equal to sum of masses of two protons and two neutrons


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