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Question

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

A
237,93
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B
237,94
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C
221,84
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D
237,92
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Solution

The correct option is B 237,94
Given: A8=224 and Z5=89
A=237,Z=94

zXAz1YA+e++V
2α+z5XA8

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