What element has isotopes known as deuterium and tritium?
  1. Bromine
  2. Helium
  3. Oxygen
  4. Hydrogen
  5. Chlorine
Explanation
Answer: Hydrogen

Hydrogen has isotopes known as deuterium and tritium. Protium, most common isotope of hydrogen, has one proton and no neutrons. Deuterium has one proton and one neutron, while tritium has one proton and two neutrons.
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