Valence Electrons in Iodine (I)

Calculate the number of valence electrons in Iodine 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 Iodine

Determine the number of valence electrons in Iodine (I, Element 53)

Step 1: Look up the electronic configuration for Iodine

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

[Kr] 4d10 5s2 5p5

Calculate Electronic Configuration for Iodine

Step 2: Identify the outermost electrons using the electronic configuration

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

4d10 5s2 5p5

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 = 5) are valence electrons.


Iodine (I) has 7 (2 + 5) valence electrons.

Lewis Dot for I