Hydrogen has three isotopes-protium $\left({}_1{}^1\mathrm{H}\right)$, deuterium $\left({}_1{}^2\mathrm{H}\right)$ and tritium $\left({}_1{}^3\mathrm{H}\right)$. These isotopes differ from one another in respect of the presence of

Hydrogen has three isotopes-protium $\left({}_1{}^1\mathrm{H}\right)$, deuterium $\left({}_1{}^2\mathrm{H}\right)$ and tritium $\left({}_1{}^3\mathrm{H}\right)$. These isotopes differ from one another in respect of the presence of neutrons. In protium, deuterium and tritium number of neutrons respectively are 0,1 and 2.