When an ionic bond is formed between Na and Cl, the lone electron in Sodium's outer shell leaves, and completes Chlorines outer shell.
Are there any physical characteristics that I can use as an observer to see this movement?
When the reaction begins (as seen in this video https://www.youtube.com/watch?v=oZdQJi-UwYs) a lot of light and heat is created. Is this the electron moving from one atom to the other? If not, what is causing it?
Secondary to this. Why does the reaction need help (by either adding water in the video above, or pre-heating the Sodium before dropping it in the Chlorine gas) before it gets started?