A) \[\alpha \]-partide
B) \[\beta \]-particle
C) Positron
D) Electron capture
Correct Answer: A
Solution :
By the emission of one a-particle, there comes a decrease of 4 units in atomic weight and 2 units in atomic number. Hence, the daughter nucleus is never an isobar of the parent nucleus after emitting a-rays. (isobars have equal atomic mass and different atomic numbers).
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