Question

Deuterium is an isotope of hydrogen and is represented by ${}_1^2\text{H}$. How many deuterium atoms are present in heavy water?

• A. 1
• B. 2
• C. 3
• D. 4

Answer 1

The correct option is B

2

Deuterium is an isotope of hydrogen. It has only one electron. The chemical formula of heavy water is ${\text{D}}_2\text{O}$. Thus, there are two deuterium atoms in a molecule of a heavy water.