# Why is there such a violent reaction when NaCl is formed?

In school I saw how $\ce{NaCl}$ was formed and I noticed that there was a violent reaction. Can someone tell me why there is such a violent reaction? The $\ce{NaCl}$ was formed by reacting sodium metal and chlorine gas.

• It will depend on what the reaction was - what other reagents and conditions were involved? NaCl can be formed many ways. – long Oct 25 '16 at 21:59
• Solid sodium and chlorine gas. – vfighter919 Oct 25 '16 at 22:01