A positively charged particle emitted from the nuclei of certain atoms during radioactive disintegration. The alpha particle has an atomic weight of 4 and a positive charge equal in magnitude to 2 electronic charges; hence it is essentially a the nucleus of helium consisting of two protons and two neutrons, He2+.
Alpha particles rapidly dissipate their energy as they pass through materials, and are far less penetrating than beta particles and gamma rays.
|alpha particle mass||6.64465598e-27||kg||Clip|
|alpha particle to electron mass ratio||7294.299508||Clip|
|alpha particle to proton mass ratio||3.9725996846||Clip|
|alpha particle molar mass||4.0015061747e-3||kgmol-1||Clip|