Hi
came across some info on Iron + Chlorine = ?
Firstly u no about electron configurations, well the electon configuration of Iron is 2,8,14,2 - so there are two electrons in the outer shell.
The iron atom needs to lose 2 electrons

Chlorine has an electron configuration of 2,8,7 because it has 17 protons/electrons

When Chlorine reacts with Iron this happens -

As you can see in the diagram there are 2 chlorines sharing 2 electrons from the Iron - it takes 2 chlorines to make a full structure for both iron and chlorine
So Iron + chlorine = Iron chloride OR Fe + Cl2 = FeCl2