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How may alpha- and beta- particles will ...

How may `alpha-` and `beta-` particles will be emitted when `._(90)Th^(232)` changes into `._(82)Pb^(208)`?

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Suppose `._(90)Th^(232) rarr ._(82)Pb^(208) + m_(2)^(4) He + n_(-1)^(0)e`
Equating mass numbers: `232 = 208 + 4m` or `m = 6`
Equating atomic numbers: `90 = 82 + 12 + (-n)`
or `n = 4`
Thus, `6alpha` and `4beta^(-)` particles will be emitted.
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P BAHADUR-RADIO ACTIVITY-Exercies 9
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