Tritium is a radioactive isotope of hydrogen. Its nucleus consists of one proton and two neutrons.

Tritium is an isotope of the element Hydrogen

Tritium is an isotope of the element Hydrogen. Isotopes are atoms of the same element that have the same number of protons but different numbers of neutrons. Hydrogen is the first element on the periodic table and has three isotopes: protium, deuterium, and tritium.

Isotopes of Hydrogen:
- Protium: This is the most common isotope of hydrogen and has one proton and no neutrons. It is symbolized as 1H or H.
- Deuterium: This is the second isotope of hydrogen and has one proton and one neutron. It is symbolized as 2H or D.
- Tritium: This is the third isotope of hydrogen and has one proton and two neutrons. It is symbolized as 3H or T.

Properties of Tritium:
- Tritium is a radioactive isotope of hydrogen, meaning it is unstable and undergoes radioactive decay.
- It has a half-life of about 12.3 years, which means that over time, half of the tritium atoms will decay into helium-3.
- Tritium is commonly used in nuclear fusion reactions and as a fuel in thermonuclear weapons.
- It is also used in glow-in-the-dark signs and exit signs, where the radioactive decay of tritium produces a glow.

Identification of Tritium:
- Tritium can be identified by its symbol 3H or T, which represents its atomic number (1) and mass number (3).
- It is also identified by its properties, such as its radioactive nature and the presence of two neutrons.

Conclusion:
In conclusion, tritium is an isotope of the element hydrogen. It has one proton and two neutrons, distinguishing it from the other isotopes of hydrogen. Tritium is radioactive and has various applications in nuclear reactions and the production of glow-in-the-dark materials.