Underline/Select the word which does not belong to the group: hydrogen, helium, tritium, deuterium.
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helium is the answer......
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Helium does not belong to the group of hydrogen, helium, tritium, and deuterium.
Hydrogen, tritium, and deuterium are the isotopes of the same element.
Helium on the other hand is not an isotope of Hydrogen, and is noble gas.
This is why helium does belong in the group mentioned in the question.
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