A) 220 and 86
B) 225 and 87
C) 228 and 88
D) 224 and 86
Correct Answer: A
Solution :
When an a-particle is emitted by any nucleus than atomic weight decreases by four units and atomic number decreases by two units \[_{88}R{{a}^{224}}\xrightarrow{-\alpha }{{\,}_{86}}{{X}^{220}}\]
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