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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

A

236 and 92

B

234 and 90

C

238 and 90

D

236 and 90

Text Solution

Verified by Experts

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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Knowledge Check

  • If uranium (mass number = 238 and atomic number = 92) emits an alpha -particle, the product has mass number and atomic number respectively are

    A
    236 and 92
    B
    236 and 90
    C
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    D
    234 and 90

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    234 and 90
    C
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    D
    236 and 90

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