Laser Technician (International Board of Electrologist Certification) IBEC Board Exam

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How many hydrogen atoms are found in a water molecule?

One
Two
Three
Four

The correct answer is: Two

A water molecule is composed of two hydrogen atoms bonded to one oxygen atom, which is represented by the chemical formula H₂O. In this molecular structure, the 'H' represents hydrogen and the 'O' represents oxygen. The subscript '2' after the hydrogen symbol indicates that there are two hydrogen atoms involved in the formation of each water molecule. This is fundamental in understanding the composition of water and is critical for various scientific applications, including chemistry and biology, where water is often discussed in terms of its molecular structure. The other options list incorrect numbers of hydrogen atoms, either too few or too many, failing to accurately represent the molecular formula of water.