Question

${}_z{X}^A$ and ${}_{z+1}{Y}^A$ are two radioactive elements. X emits one $\alpha$ particle whereas Y emits one $\beta$ particle. The daughter nuclei formed are ___________.

• A. isotopes
• B. isobars
• C. isotones
• D. isomorphs

Answer 1

The correct option is C isotones

When ${}_Z{X}^A$ emits alpha particles it becomes ${}_{Z-2}{X}^{A-4}$ and when ${}_{Z+1}{Y}^A$ emits beta particles it becomes ${}_Z{X}^A$

Since, these nuclides have same number of neutrons and different number of protons, they are isotones.