What is the difference between Hydrogen and Protium?

Protium is an isotope of hydrogen but the atomic structure seems to be the same as hydrogen everywhere I look ( 1 proton, 1 electron, no neutrons ). Am I just being stupid or is there no difference at all?


Don’t trust that link.


Google is a wonderful tool “What is the difference between Hydrogen and Protium?”:

Abhinav Gotmare, studies Bachelor of Science in Computer Science at Shivaji Science College, Nagpur (2023) Answered January 25, 2019

Protium is the most prevalent hydrogenisotope, with an abundance of 99.98%. It consists of one proton and one electron. It is typically not found in its monoatomic form, but bonded with itself (H2) or other elements.

Hydrogen is generally found as diatomic hydrogen gas H2, or it combines with other atoms in compounds—monoatomic hydrogen is rare. The H–H bond is one of the strongest bonds in nature, with a bond dissociation enthalpy of 435.88 kJ/mol at 298 K. As a consequence, H2 dissociates to only a minor extent until higher temperatures are reached. At 3000K, the degree of dissociation is only 7.85%. Hydrogen atoms are so reactive that they combine with almost all elements.

Thank you for such a clear explanation.