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These are the Hydrogen isotopes with the least mass:

Hydrogen 1-protium

Hydrogen 2-deuterium

Hydrogen 3-tritium

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Which is the most abundant isotope for hydrogen?

Tritium is the most abundant hydrogen isotope


Which atom has an average mass not equal to its common isotope?

Hydrogen atom has an average mass not equal to its common isotope. The most common isotope of hydrogen, hydrogen-1, does not have a neutron in its nucleus, while the average mass of a hydrogen atom accounts for the other isotopes of hydrogen which do contain neutrons.


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Abundant


What is a complete sentence for the word isotope?

Hydrogen atom have three isotope which is hydrogen , deuterium , and tritium.


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What is the mass number of the most common isotope of carbon?

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The element has a mass number and atomic number of 1?

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