Calculate the number of valence electrons in Iodine using its electron configuration step by step.
Determine the number of valence electrons in Iodine (I, Element 53)
The abbreviated (condensed) ground electronic configuration for Iodine is:
[Kr] 4d10 5s2 5p5
Electrons in atomic orbitals outside the [Kr] core are the outermost electrons:
4d10 5s2 5p5
Extract the principle quantum number, n, and number of electrons from the electron configuration:
|Electron Configuration||n||Orbital||Number of Electrons|
The outermost electrons with the largest principal quantum number (in this case, n = 5) are valence electrons.
Iodine (I) has 7 (2 + 5) valence electrons.