is also known as heavy hydrogen.

Deuterium

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Tritium

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Protium

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Solution

The correct option is A Deuterium
Deuterium, an isotope of hydrogen given by $21 H$ , is also known as heavy hydrogen because of the extra neutron in the atomic nucleus. It combines with oxygen to form heavy water $D_{2} O$ .

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D₂O is known as:

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