A) an isotope
B) an isobar
C) an isotone
D) an isodiaphere
Correct Answer: A
Solution :
\[_{92}^{238}M\xrightarrow{-\alpha }_{90}^{234}X\xrightarrow{-\beta }_{91}^{234}Y\xrightarrow{-\beta }_{92}^{234}Z\] The atomic number of radioactive element \[(_{92}^{238}M)\] and daughter element \[(_{92}^{234}Z)\] is same hence they are isotopes.
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