Name the isotopes of hydrogen. What is importance of the heavier isotopes of hydrogen?

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Name the isotopes of hydrogen. What is importance of the heavier isotopes of hydrogen?

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Three isotopes of hydrogen are
a. Protium (._(1)^(1)H: Its atomic mass is 1.008 123 am u. In 1s nucleus consists of one proton and one electron in 1s energy level. It constitues 99.985% of natural hydrogen.
b. Deuterium (._(2)^(1)Hor D) or heavy hydrogen: its atomic mass is 2.014 amu. an atom of deuterium has one proton and one neutron in its nucleus, 0.015% exists in natural hydrogen.
c. Tritium(._(3)^(1)H or T): Its atomic mass is 3.01 amu. an atom of tritium has one proton and two neutrons is its nucleus. tritium atoms are unstable and are radioactive whereas the former two are non-radioactive. It is found in heavy water. heavy water is used to control the nuclear reaction in nuclear reactor and helps to slow down the speed of neutrons.