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OpenStudy (anonymous):
When a radioactive isotope releases an alpha particle, the mass number of the atom is decreased by two. decreased by four. increased by two. increased by four.
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OpenStudy (abmon98):
Alpha radiation consists of alpha particles. An alpha particle is identical to the nucleus of a helium atom, which comprises two protons and two neutrons. When an alpha particle is emitted from a nucleus the nucleus loses two protons and two neutrons. This means the atomic mass number decreases by 4 and the atomic number decreases by 2.
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