Valence Electrons in Radium (Ra)

Calculate the number of valence electrons in Radium 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 Radium

Determine the number of valence electrons in Radium (Ra, Element 88)

Step 1: Look up the electronic configuration for Radium

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

[Rn] 7s2

Calculate Electronic Configuration for Radium

Step 2: Identify the outermost electrons using the electronic configuration

Electrons in atomic orbitals outside the [Rn] 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 = 7) are valence electrons.


Radium (Ra) has 2 valence electron(s).

Lewis Dot for Ra