$X \stackrel{a}{\longrightarrow} Y$
$Y \underset{2 \beta}{\longrightarrow} Z$
, ત્યારે
\(x \stackrel{\alpha}{\longrightarrow} y\)
\(\therefore y=x_{z-2}^{m-4}\)
\(y \stackrel{2 \beta}{\longrightarrow} z\)
\(\therefore z=x_{z-2+2}^{m-4}\)
Hence, \(x\) and \(z\) are isotopes.
[ $He$ નું દળ $4.0026 \,a.m.u., \,O$ નું દળ $15.9994\, a.m.u.$]
$\left(\log _{10} 1.88=0.274\right.)$ લો.