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Deuterium

/duˈtiriəm/
C1
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Definition

(noun) An isotope of hydrogen with one proton and one neutron in each atom - 21H.

Sentence Examples
There were about 80 deuteriums for every million protiums, and virtually no tritium.
CEFR Practice Quiz
There were about 80 ____ for every million protiums, and virtually no tritium.

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