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Rutherford's Experiment

• Previous theory was plum pudding theory, atom filled with positively charged matter with randomly dispersed negative electrons.
• Rutherford expected: Expected nearly all to pass straight through
• Rutherford observed: Most passed straight through, some deflected and some reflected.
• Rutherford concluded: Since most pass through, most of atom is empty space. Since some reflected/deflected suggested the mass of the atom is concentrated in small positively charged nucleus.
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Particles

• Alpha particles are helium nuclei.
• Beta particles are electrons
• Every particles has a antiparticle, the antiparticle for an electron is the positiron
• Neutrinos are mass-less and charge-less particles and have anti-neutrino antiparticles
• Fundamental Particles