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Radioactive element of alkaline earth metal is succession loses `alpha-` and `beta-` particles. How many particles it can loose before forming stable

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Radioactive element of alkaline earth metal is succession loses `alpha-` and `beta-` particles. How many particles it can loose before forming stable element?
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Correct Answer - `6`
`._(88)Ra^(24) rarr ._(82)Pb^(208) + 4 ._(2)He^(4) + 2 ._(-1)e^(0)`
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