Valence Electrons in Francium (Fr)
Calculate the number of valence electrons in Francium using its electron configuration step by step.
Valence Electrons in Francium
Determine the number of valence electrons in Francium (Fr, Element 87)
Step 1: Look up the electronic configuration for Francium
The abbreviated (condensed) ground electronic configuration for Francium is:
[Rn] 7s1
Calculate Electronic Configuration for Francium
Step 2: Identify the outermost electrons using the electronic configuration
Electrons in atomic orbitals outside the [Rn] core are the outermost electrons:
7s1
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 Configuration | n | Orbital | Number of Electrons |
|---|---|---|---|
| 7s1 | 7 | s | 1 |
The outermost electrons with the largest principal quantum number (in this case, n = 7) are valence electrons.
Answer
Francium (Fr) has 1 valence electron(s).
