Multiple choice

Which of the following is not an isotope of hydrogen?

  1. Protium

  2. Yttrium

  3. Deuterium

  4. Tritium
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Protium (¹H), Deuterium (²H or D), and Tritium (³H or T) are the three isotopes of hydrogen, differing only in neutron count. Yttrium (Y) is a separate transition metal element (atomic number 39) in Group 3 of the periodic table, not related to hydrogen.

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