Alpha particles, composed of two protons and two neutrons, are positively charged and thus interact strongly with other charged particles. As they travel through matter, they are repelled by atomic nuclei (which are also positively charged) and attract electrons (which are negatively charged). This interaction causes alpha particles to lose energy rapidly, resulting in a short range in materials and leading to their eventual capture by nearby atoms. Overall, their path is influenced by the electromagnetic forces between them and other subatomic particles, primarily electrons and nuclei.
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