1. ### noahsdev

29
**EDIT** Never mind just realised that it is lead(II) in PbI2. Hehe... Awkward
Why does lead iodide have the formula PbI2?
Pb needs to lose (or gain) 4 electrons to have a stable octet and Iodine needs to gain only 1. So why isn't the equation PbI4? It seems like it should be... Please explain if you can.
Thanks :)

Last edited: Sep 7, 2013
2. ### SteamKing

9,113
Staff Emeritus
Lead is one of those elements with multiple oxidation states (either +2 or +4). The most common state is +2, which is why lead iodide is PbI2

3. ### noahsdev

29
Haha I just realised. Thanks :D