The mass of an alpha particle is the mass of its constituent protons and neutrons, which is very close to the mass of a helium nucleus. A helium atom consists of a helium nucleus and two electrons. Since the mass of electrons is significantly smaller than the mass of protons and neutrons, the mass of an alpha particle is very nearly equal to the mass of a helium atom.
The alpha particle carries two positive charges. Its mass is very nearly equal to that of
Asked in UPPCS Prelims 1996 · Topic: Nuclear Physics (Basic properties of nuclei: size, shape, charge, mass, spin, magnetic dipole and electric quadrupole moments.)
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