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48 When an atom of the unstable isotope Na-24 decays, it becomes an atom of Mg-24 because the Na-24 atom spontaneously releases(1) an alpha particle (3) a neutron(2) a beta particle (4) a positron
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48 When an atom of the unstable isotope Na-24 decays, it becomes an atom of Mg-24 because the Na-24 atom spontaneously releases(1) an alpha particle (3) a neutron(2) a beta particle (4) a positron

User Florian Mielke
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(1) a beta particle is your answer. Na-24 decays through beta decay, turning a neutron into a proton, electron (beta particle), and an neutrino.
User Marichyasana
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