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An element X decays , first by positron ...

An element` X` decays , first by positron emission and then two `alpha`-particles are emitted in successive radiactive decay. If the product nucleus has a mass number `229` and atomic number `89`, the mass number and atomic number of element ` X` are.

A

237,93

B

237,94

C

221,84

D

237,92

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The correct Answer is:
B
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