Valence Electrons in Krypton (Kr)
Calculate the number of valence electrons in Krypton using its electron configuration step by step.
Valence Electrons in Krypton
Determine the number of valence electrons in Krypton (Kr, Element 36)
Step 1: Look up the electronic configuration for Krypton
The abbreviated (condensed) ground electronic configuration for Krypton is:
[Ar] 3d10 4s2 4p6
Calculate Electronic Configuration for Krypton
Step 2: Identify the outermost electrons using the electronic configuration
Electrons in atomic orbitals outside the [Ar] core are the outermost electrons:
3d10 4s2 4p6
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 |
|---|---|---|---|
| 3d10 | 3 | d | 10 |
| 4s2 | 4 | s | 2 |
| 4p6 | 4 | p | 6 |
The outermost electrons with the largest principal quantum number (in this case, n = 4) are valence electrons.
Answer
Krypton (Kr) has 8 (2 + 6) valence electrons.
