what I alpha particles
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Alpha particles (a) are compositeparticles consisting of two protons and two neutrons tightly bound together (Figure 1). They are emitted from the nucleus of some radionuclides during a form of radioactive decay, called alpha-decay.
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alpa particle, positive charged particle identical to nucleus of helium-4 atom spontaneously emitted from radioactive substances, consisting of 2 protons and 2 neutron bound together ,thus having mass of 4 unit and a positive charge of two
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