what are Alpha Particles?
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Alpha particles (a) are composite particles consisting of two protons and two neutrons tightly bound together.
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They are emitted from the nucleus of some radionuclides during a form of radioactive decay, called alpha-decay.
Alpha particle, positively charged particle, identical to the nucleus of the helium-4 atom, spontaneously emitted by some radioactive substances, consisting of two protons and two neutrons bound together, thus having a mass of four units and a positive charge of two.
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