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In the decay series .(92)U^(238) to .(82...

In the decay series `._(92)U^(238)` to `._(82)Pb^(206)`, how many `alpha`-paritcles and how many `beta^(ɵ)`-particles are emitted?

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`._(90)Th^(234) rarr ._(82)Pb^(206) + m _(2)^(4) He + n _(-1)^(0)e`
Where `m 'alpha'` and `n 'beta'` particles are given out. Equating mass number: `234 = 206 + 4m + 0`
`:. m = 7`
Equacting atomic number: `90 = 82 + 2m + n xx (-1)`
`:. n = 6 (:' m = 7`)
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