Why alpha paricles do not penetrate through nucleus?
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As the nucleus is densely packed with protons and neutrons the alpha particles gets deflected back.
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At these high speeds they have enough energy to break bonds in matter or ionise atoms (knock electrons off), which is especially deleterious for living cells. An interesting thing about alpha particles is that they do not penetrate far through matter (unlike beta or gamma radiation). They are stopped by paper!
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