Discussion
What are the particles emitted by a radioactive element after three consecutive disintegrations that leave it in the same group of the periodic table?
Answer: C
The particles are one alpha and two beta.
An alpha emission lowers the atomic number by 2 and a beta emission raises it by 1: \[Z \rightarrow Z-2+1+1 = Z\] So the nucleus returns to the same group of the periodic table, though its mass number has fallen by 4 - the daughter is an isotope of the original element.
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