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Which of the following is not an isotope of hydrogen?

  • A.Tritium
  • B.Deuterium
  • C.Protium
  • D.Yttrium

Answer: D

Yttrium is not an isotope of hydrogen - it is a separate element, atomic number 39.

Hydrogen has three isotopes: protium, with one proton and no neutron; deuterium, with one neutron; and tritium, with two, which is radioactive.

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