Even though it is highly toxic in the natural gas form, its ions are essential to life. Because of chlorine, we can make drinking water safe, destroy germs, produce medicines, and have salt needed for a balanced diet. It is most commonly seen as a compound NaCl, in salt or seawater. The gas form of chlorine is a respiratory irritant because it irritates the mucous membranes . The liquid form of chlorine burns the skin.
Chlorine can be fatal after only a few deep breaths.