Question

When any radioactive element emits $\beta$ particle, some product is obtained. They both are:

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

Answer 1

The correct option is B isobars

(i) Loss of $\beta$ particles results an increase in atomic number by 1 whereas atomic mass remains same.
(ii) Isobars are atoms of different elements having same atomic masses but different atomic numbers.
${}_x{A}^y-\beta {⟶}_{z+1}{Z}^y$
$\therefore A$ and $Z$ are isobars.