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Nonportrit
A alpha particle is a "particle that contains two protons and two neutrons that are together  produced in the process of alpha decay."

Hope this helps!
AL2006
An alpha particle ... one of the things that come shooting out of
some radioactive decay events ... is a package of two protons
and two neutrons. 

Looking at it another way, it's a Helium nucleus ... an atom of
Helium without any electrons.