original question: Which periodic table block has the isotope of [Tritium]?
answer: s-block
answer type: Periodic table block.
auxiliary information: Tritium is a radioactive isotope of hydrogen. The nucleus of tritium contains one proton and two neutrons, whereas the nucleus of protium contains one proton and no neutrons. Naturally occurring tritium is extremely rare on Earth, where trace amounts are formed by the interaction of the atmosphere with cosmic rays. The name of this isotope is formed from the Greek word "tritos" meaning "third".
The isotop of [Tritium] is located in which table block on the periodic table?