Meaning of ALPHA PARTICLE in English

ALPHA PARTICLE

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( 4 2 He) A particle that is commonly ejected from radioactive nuclei, consisting of two protons and two neutrons. Alpha particles are helium nuclei. Alpha particles have a mass of 6.644 655 98 × 10 -27 kg or 4.001 506 1747 atomic mass units . [ 1998 CODATA values ]

General chemistry English glossary.      Английский глоссарий общей химии.