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""(90)^(234) Th disintegrates to gives ...

`""_(90)^(234)` Th disintegrates to gives `""_(82)^(206)`Pb. Calculat the number of `alpha ` - and `beta` - particle emitted during this disintegration.

Text Solution

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(a) Change in mass number ` = 234 - 206 = 28`
Number of `alpha` particles emitted `= (28)/(4) = 7`
(b) For the emission of ` 7 alpha ` particle, change in atomic number ` = 90 - 7 xx 2`
` = 90 - 14 = 76`
`therefore ` Number of `beta` - particle emiited
` = 82 - 76 = 6`
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