A) Isobars
B) Isotopes
C) Isotones
D) Isomers
Correct Answer: A
Solution :
When a \[\beta -\]particle is emitted, the atomic number is increased by one while atomic mass (mass number) remains unchanged, \[ie,\] \[{{\,}_{Z}}{{X}^{A}}\xrightarrow{-\beta }{{\,}_{Z+1}}{{X}^{A}}\] Since, the species having same mass number but different atomic number, are called isobars, thus, the parent and daughter nuclei (which is formed after emission of \[\beta -\]particle) are isobars.
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