Question

$X$ and $Y$ are two radioactive isobars. Then the daughter nuclei formed after the emission of a $\beta$ particle from each of them are _______ .

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

Answer 1

The correct option is C isobars

Since X and Y are radioactive isobars. So, their atomic mass will be same but atomic numbers will be different.

${}_Z{X}^A{}_{Z^{\prime }}{Y}^A$

After ${}_{-1}{\beta }^o$ decay

${}_{Z-1}{X}^A{}_{Z^{\prime }-1}{Y}^A$

After decay also, they have same atomic mass but different atomic number. So, they are isobars.