Question

A nucleus ${}_{11}{}^{24}\mathrm{Na}$ emits a beta particle to change into magnesium (Mg).

What is the general name of ${}_{12}{}^{24}\mathrm{Mg}$ with respect to ${}_{11}{}^{24}\mathrm{Na}$

Answer 1

1. Isobars are those elements that have a different atomic number but the same mass number.
2. In ${}_{12}{}^{24}\mathrm{Mg}$ and ${}_{11}{}^{24}\mathrm{Na}$ mass number is same hence they are called isobars.