Fluorine is an element, and like all elements, it is made up of only one type of atom. In the case of fluorine, that atom is the fluorine atom.

Here's a breakdown of the particles within a fluorine atom:

* Protons: 9

* Neutrons: 10 (for the most common isotope, Fluorine-19)

* Electrons: 9

Let's break down why this is important:

* Protons: These particles carry a positive charge and determine the element's identity. All fluorine atoms have 9 protons.

* Neutrons: These particles have no charge. The number of neutrons can vary slightly, creating different isotopes of the same element. Fluorine-19 is the most common isotope, having 10 neutrons.

* Electrons: These particles carry a negative charge and orbit the nucleus. To be neutral, a fluorine atom has the same number of electrons as protons (9).

So, in essence, the particles in fluorine are protons, neutrons, and electrons, all found within the fluorine atom.