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Question

What will be the daughter nuclei after 4 alpha decays of 231 91Pa?


A

227 89X

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B

215 83X

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C

215 75X

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D

215 78X

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Solution

The correct option is B

215 83X


An alpha ray is a Helium nuclei with atomic number 2 and mass number 4.
One alpha ray emission reduces the atomic number by 2 and mass number by 4.
So 4 alpha ray emission will totally reduce the atomic number by 8 and mass number by 16.
Now let's check the options and see which one fits.
Mass number will become 231-16 = 215
Atomic number will become 91-8 = 83
215 83X


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