Alpha Particle

The nucleus of helium consisting of two protons and two neutrons. Alpha particles rapidly dissipate their energy as they pass through materials, and are far less penetrating than beta particles and gamma rays.

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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

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See also: Alpha Radiation, Beta Particle, Gamma Rays, Geiger, Johannes, Helium, Neutron, Proton, Radioactive Decay.