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Why do radioactive element decay?...

Why do radioactive element decay?

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The stable nuclei are found to have `n//p` ratio in the range `1` to `1.5` . The nuclei whose `n//p` ratio lies outside this range `i.e.,(lt1)` or `(gt1.5)` lose `alpha-`or `beta-`particles so that their `n//p` ratio shifts into the stability belt.
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