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

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(N/A) Hydrogen has three isotopes: Protium $(^1_1H)$,Deuterium ($^2_1H$ or $D$),and Tritium ($^3_1H$ or $T$).
These isotopes differ from one another in the number of neutrons present in the nucleus.
$1$. Protium $(^1_1H)$: Contains $0$ neutrons.
$2$. Deuterium $(^2_1H)$: Contains $1$ neutron.
$3$. Tritium $(^3_1H)$: Contains $2$ neutrons.
Among these,only Tritium is radioactive. The mass ratio of these isotopes (Protium : Deuterium : Tritium) is $1 : 2 : 3$.

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