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What Particle?. I have a charge of 2 AlphaI can be stopped by 3 mm of AlBetaI am a high speed electronBetaI am pure energy or a EMGamma. What Particle?. I am the nucleus of a helium nucleusAlphaI have no chargeGammaI am negativeBetaI have 2 protons and 2 neutronsAlpha. What Particle?.
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