Question

In the Radioactive transformation $Z$ $\underrightarrow{\alpha }$ $Y$ $\underrightarrow{\beta }$ $X$ $\underrightarrow{\beta }$ $R$ ; the nuclei of $R$ and $Z$ are

• A. Isotopes
• B. Isobars
• C. Isomers
• D. Isotones

Answer 1

The correct option is A Isotopes

Alpha particle emission reduces the atomic number by $2$.

Hence, Atomic Number of $Y=$ Atomic Number of $Z-2$
Beta emission increases the atomic number by $1$. Hence, Atomic Number of $X$ is that of $Y+1$
Similarly, Atomic number of $R$ is Atomic Number of $X+1$, which is Same as $Y+2$ and hence, $R$ has same atomic number as $Z$ , but different mass numbers.
Hence, $R$ and $Z$ are isotopes.