Write the names of isotopes of hydrogen. What is the mass ratio of these isotopes?
Hydrogen has three isotopes. They are:
1. Protium, `""_1^1H`
2. Deuterium, `""_1^2H` or D, and
3. Tritium, `""_1^3H` or T
The mass ratio of protium, deuterium and tritium is 1:2:3.