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If uranium ( mass number 238 and atomic ...

If uranium `(` mass number 238 and atomic number 92`)` emits an `alpha-`paticle, the produc has mass number and atomic number

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The correct Answer is:
B
Emission of an `alpha-` particle means mass is decreased by 4 units and charge byy 2 units. Thus,
`._(92)U^(238)overset(-alpha)rarr._(90)U^(234)`
Thus, the mass number `=234`
Atomic number `=90`
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