The number of beta particles emitted by a radioactive substance is twice the number of alpha particles…
The number of beta particles emitted by a radioactive substance is twice the number of alpha particles emitted by it. The resulting daughter is an
isobar of parent
isomer of parent
isotone of parent
isotope of parent
Solution
Let the radioactive substance be ${ }_{\mathrm{Z}}^{\mathrm{A}} \mathrm{X}$ Radioactive transition is given by
${ }_{\mathrm{Z}}^{\mathrm{A}} \mathrm{X} \stackrel{-\alpha}{\longrightarrow}{ }_{\mathrm{Z}-2}^{\mathrm{A}-4} \mathrm{X} \stackrel{-2 \beta}{\longrightarrow}{ }_{\mathrm{A}-4} \mathrm{X}$
The atoms of element having same atomic number but different mass numbers are called isotopes.
So, ${ }_Z^A X$ and ${ }_Z^{A-4} X$ are isotopes.