Valence Electrons in Roentgenium (Rg)

Valence Electrons in Roentgenium

Determine the number of valence electrons in Roentgenium (Rg, Element 111)

Step 1: Look up the electronic configuration for Roentgenium

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

[Rn] 5f¹⁴ 6d⁹ 7s²

Calculate Electronic Configuration for Roentgenium

Step 2: Identify the outermost electrons using the electronic configuration

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

5f¹⁴ 6d⁹ 7s²

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 = 7) are valence electrons.

Answer

Roentgenium (Rg) has 2 valence electron(s).