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Question

Let us consider emission of α-particle from uranium nucleus:
92U2352He4 90Th231
e=92 e=0 e=90
p=92 p=2 p=90
n=143 n=2 n=141
Shortage of two electrons in thorium is due to:

A
conversion of electron to positron
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B
combination with positron to evolve energy
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C
annihilation
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D
absorption in the nucleus
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Solution

The correct options are
C combination with positron to evolve energy
D annihilation
Storage of two es in thorium is due to combination with positron to evolve energy and annihilation. As this reaction is nuclear fission, giving lighter particle from heavier particle.

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