Here's the breakdown of protons, neutrons, and electrons in Cesium (Cs):

* Protons: The number of protons defines the element. Cesium has 55 protons.

* Neutrons: This can vary, creating different isotopes of the element. The most common isotope of Cesium (Cesium-133) has 78 neutrons.

* Electrons: In a neutral atom, the number of electrons equals the number of protons. So, Cesium has 55 electrons.

Important Note: There are multiple isotopes of Cesium, meaning they have the same number of protons but different numbers of neutrons. The number of neutrons affects the atomic mass.