Tritium is an isotope of:
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Hydrogen
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Helium
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Uranium
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Radium
A
Correct answer
Explanation
Tritium is a radioactive isotope of hydrogen with one proton and two neutrons, making it hydrogen-3. It is used in glow-in-the-dark watch faces and as a tracer in scientific experiments. The other options are elements that have their own distinct isotopes but tritium specifically refers to hydrogen.