Question

The most abundant isotope of hydrogen is

• A. Tritium
• B. Deuterium
• C. Protium
• D. Para hydrogen

Answer 1

The correct option is C Protium

Protium is the most abundant hydrogen isotope, with an abundance of 99.984%. It consists of one proton and one electron with no neutron. It is typically not found in its monoatomic form, but bonded with itself (H₂) or other elements.
The abundance of deuterium and tritium are $0.016$ % and ${10}^{-15}$ % respectively.
Para hydrogen is not a isotope of hydrogen.
Hence, the correct answer is option (c)