(A) deuterium
(B) polonium
(C) tritium
(D) uranium
Ans. (C) tritium
The lightest radioactive element is tritium, 3H, an isotope of hydrogen. It's hydrogen with its one proton, but it has two neutrons hanging around in its nucleus as well. Tritium, 3H, is created naturally by cosmic rays. It has a half-life of 12.32 years, at which time it undergoes decay to 3He. It is also the product of neutron activation or neutron capture in nuclear reactors.
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