Valence Electrons in Bromine (Br)

Calculate the number of valence electrons in Bromine 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 Bromine

Determine the number of valence electrons in Bromine (Br, Element 35)

Step 1: Look up the electronic configuration for Bromine

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

[Ar] 3d10 4s2 4p5

Calculate Electronic Configuration for Bromine

Step 2: Identify the outermost electrons using the electronic configuration

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

3d10 4s2 4p5

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 = 4) are valence electrons.


Bromine (Br) has 7 (2 + 5) valence electrons.

Lewis Dot for Br