00:02
Let's determine the number of valance electrons in each of the following elements.
00:06
For a, zinc, and in order to determine the number of valance electrons, we need the electron configuration and core notation.
00:14
The electron configuration of zinc in core notation is argon, 4s2, 3d10.
00:24
The valance electrons are all of the electrons except the core and a full d shell.
00:29
So we can see here that we are left with the 4s2.
00:34
Zinc will have two valence electrons.
00:45
Next look at the element iodine, which has an electron configuration and core notation krypton, 5s2, 4d10, 5p5...