Write the names of the isotopes of hydrogen. What is the mass ratio of these isotopes?

(N/A) Hydrogen has three naturally occurring isotopes:
$1.$ Protium,$\_1^1H$
$2.$ Deuterium,$\_1^2H$ or $D$
$3.$ Tritium,$\_1^3H$ or $T$
The mass numbers of these isotopes are $1$,$2$,and $3$ respectively.
Therefore,the mass ratio of protium,deuterium,and tritium is $1: 2: 3$.