The $\mathrm{n}/\mathrm{p}$ ratio for${ }_1{\mathrm{H}}^1$ is :

The quantity of neutrons in ${ }_1{\mathrm{H}}^1$ is,

$\begin{array}{l}\mathrm{n}=1-1\\ \mathrm{n}=0\end{array}$

The quantity of proton is,

p = 1

The n/p ratio is,

$\begin{array}{l}\mathrm{n}/\mathrm{p}=0/1\\ \mathrm{n}/\mathrm{p}=0\end{array}$