* 8 protons: This is the defining characteristic of oxygen, as the number of protons determines the element.

* 8 electrons: In a neutral atom, the number of protons and electrons is equal.

* 8 neutrons: The most common isotope of oxygen has 8 neutrons. However, there are other isotopes with varying numbers of neutrons.

Important Note: The number of neutrons can vary slightly, creating different isotopes of oxygen. The most common isotope has 8 neutrons, but you'll find isotopes with 9 and 10 neutrons as well.