Problem: What is the daughter nucleus produced when 217(At) undergoes alpha decay?

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We are asked what is the daughter nucleus produced when 217(At) undergoes alpha decay


Recall that in a nuclear reaction, the number of protons and neutrons are affected and the identity of the element changes. For alpha decay, an alpha particle (42α, atomic mass = 4, atomic number = 2) is formed as a product.


The incomplete nuclear equation is:

21785 At  ___ + 42α


Atomic mass of the daughter nuclide:

217 = x + 4

x = 217 – 4213


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What is the daughter nucleus produced when 217(At) undergoes alpha decay?

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