Valence Electrons in Manganese (Mn)

Valence Electrons in Manganese

Determine the number of valence electrons in Manganese (Mn, Element 25)

Step 1: Look up the electronic configuration for Manganese

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

[Ar] 3d⁵ 4s²

Calculate Electronic Configuration for Manganese

Step 2: Identify the outermost electrons using the electronic configuration

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

3d⁵ 4s²

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:

The outermost electrons with the largest principal quantum number (in this case, n = 4) are valence electrons.

Answer

Manganese (Mn) has 2 valence electron(s).