Question

What is the relationship between the parent and daughter nuclei, when a nucleus of an atom undergoes beta emission?

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

Answer 1

Answer: (A)

When a $\beta$ - particle is emitted, the atomic number is increased by one while atomic mass (mass number) remains unchanged,
ie,${}_Z{X}^A\stackrel{-\beta }{\to }Z+1X^A$
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.