Valence Electrons in Cesium (Cs)

Calculate the number of valence electrons in Cesium using its electron configuration step by step.

Enter the atomic number or symbol of any element, and this calculator will calculate its valence electrons with steps.

Valence Electrons in Cesium

Determine the number of valence electrons in Cesium (Cs, Element 55)

Step 1: Look up the electronic configuration for Cesium

The abbreviated (condensed) ground electronic configuration for Cesium is:

[Xe] 6s1

Calculate Electronic Configuration for Cesium

Step 2: Identify the outermost electrons using the electronic configuration

Electrons in atomic orbitals outside the [Xe] core are the outermost electrons:


Step 3: Use the principle quantum number to identify the valence electrons

Extract the principle quantum number, n, and number of electrons from the electron configuration:

Electron ConfigurationnOrbitalNumber of Electrons

The outermost electrons with the largest principal quantum number (in this case, n = 6) are valence electrons.


Cesium (Cs) has 1 valence electron(s).

Lewis Dot for Cs