Valence Electrons in Iodine (I)
Calculate the number of valence electrons in Iodine using its electron configuration step by step.
Valence Electrons in Iodine
Determine the number of valence electrons in Iodine (I, Element 53)
Step 1: Look up the electronic configuration for Iodine
The abbreviated (condensed) ground electronic configuration for Iodine is:
[Kr] 4d10 5s2 5p5
Calculate Electronic Configuration for Iodine
Step 2: Identify the outermost electrons using the electronic configuration
Electrons in atomic orbitals outside the [Kr] core are the outermost electrons:
4d10 5s2 5p5
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 |
|---|---|---|---|
| 4d10 | 4 | d | 10 |
| 5s2 | 5 | s | 2 |
| 5p5 | 5 | p | 5 |
The outermost electrons with the largest principal quantum number (in this case, n = 5) are valence electrons.
Answer
Iodine (I) has 7 (2 + 5) valence electrons.
