Write the names of isotopes of hydrogen.

Question:

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

Solution:

Hydrogen has three isotopes. They are:

1. Protium, ${ }_{1}^{1} \mathrm{H}$,

2. Deuterium, ${ }_{1}^{2} \mathrm{H}$ or $\mathrm{D}$, and

3. Tritium, ${ }_{1}^{3} \mathrm{H}$ or $\mathrm{T}$

The mass ratio of protium, deuterium and tritium is $1: 2: 3$.

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