Define alpha particles and give some examples of it

Alpha particles are particles that consist of two protons and two neutrons bound together into a particle identical to a helium-4 nucleus.They are generally produced in the process of alpha decay, but may also be produced in other ways.

There is only one alpha particle, and that is the helium-4 nucleus. Note that only the nucleus is given out, not the electrons, so an alpha particle always has a charge of +2, due to the presence of two protons.

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