[Answer] How many neutrons are there in the most common isotope of hydrogen?

Answer: Zero
How many neutrons are there in the most common isotope of hydrogen?

Protium the most common isotope of hydrogen consists of one proton and one electron. Unique among all stable isotopes it has no neutrons. (see diproton for a discussion of why others do not exist) Main article: Hydrogen atom 1H (atomic mass 1.007 825 032 241(94) Da) is the most common hydrogen isotope with an abundance of more than 99.98%.

Hydrogen is the most abundant chemical substance in the universe constituting roughly 75% of all baryonic mass. Non-remnant stars are mainly composed of hydrogen in the plasma state. The most common isotope of hydrogen termed protium (name rarely used symbol 1 H) has one proton and no neutrons .

Isotopes of hydrogen – Wikipedia

Isotope – Wikipedia

Isotope – Simple English Wikipedia the free encyclopedia

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