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Question

What will be the daughter nuclei after 4 alpha decays of 23191Pa

A
22789X
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B
21583X
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C
21575X
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D
None of these
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Solution

The correct option is B 21583X
Alpha ray is 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
21583X

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