Here's how electrons are typically represented in atomic diagrams:

* Dots: Electrons in the outermost shell (valence electrons) are often shown as dots around the element's symbol.

* Orbital diagrams: Electrons are represented as arrows within boxes, with each box representing an atomic orbital.

* Electron configurations: The number of electrons in each energy level and sublevel is written in a shorthand notation.

The symbol "O" is typically used to represent the oxygen atom.

Let me know if you would like to see examples of these different representations!